Why you should use synonyms and related keywords

Using the right keywords is essential in SEO. Because using the words your audience searches with, will help your posts and pages rank. That’s why we tell you to put some effort into finding the perfect keywords to optimize your articles for. So, after finding that perfect keyword, why shouldn’t you use it over and over again? Why would you use synonyms and related keywords? Well, it might seem contradictory, but using synonyms and related keywords the right way will definitely improve your rankings. In this post, I’ll explain why. 

Variation is key

The main reason to use synonyms and related keywords in your text is that they will make your text much easier to read. If you write a text about ‘candy’ and use the word ‘candy’ in every other sentence, your text will not flow naturally and become unreadable. Your readers will most likely stop reading and leave your page or post. You’ll lose your audience. That’s why you should aim for variation in your writing. For example, words like ‘sweets’ and ‘delicacy’ could serve as synonyms for ‘candy’. And related keywords could be ‘chocolate’ and ‘sugar,’ which aren’t synonyms for ‘candy’, but are related to it and can therefore still be relevant for your text. We’ll go into that later on in this post.

So for your text to be attractive and engaging, it should be varied. This can be done in different ways. For instance, you can try to alternate long sentences with shorter ones. Longer sentences are often more difficult to process and by also using shorter sentences, your text becomes easier to read. You can also try to alternate the sequence of words to avoid too much repetition in your sentences.

But the most important thing is to vary with the exact words you use. Especially if you’re trying to rank for a long-tail keyphrase which consists of several words, such as ‘candy store New York’. Using that exact keyphrase in a lot of your sentences will make your text awful to read. Using synonyms and related keywords, on the other hand, allows you to make a text much more attractive while still being able to focus on your chosen keyphrase.

But wait, what about keyword density?

Of course, it’s important to use your focus keyword regularly and be aware of your keyword density, but you shouldn’t overdo it. In the old days, SEOs tended to stuff their texts with their keyword as much as they could. That way, Google would understand what the text was about and rank it accordingly. But Google has come a long way since then. It can read and understand texts and is on a continuous quest to better this understanding.

I’ll give you an example. If you type in ‘candy store New York’ on Google, the results will show pages about ‘candy stores’ as well as ‘candy shops’. Google understands that ‘store’ and ‘shop’ are synonyms, and treats them as such. 

Snippets from the search result page for the search ‘candy store New York’

This doesn’t take away from the fact that you should still use your focus keyword a few times throughout your post. After all, the focus keyword is still the word or phrase your audience was searching for. These are the words your audience uses and will expect to find in your text. That exact match remains important. But, to avoid using your keyword too many times – also called keyword stuffing – you can use synonyms and related keywords. That way you’re able to rank on these keywords while keeping your text attractive and readable.

How often should you use synonyms and related keywords?

The usage of synonyms versus the use of focus keywords is no exact science. The most important criterion is the way readers will experience your text. So, read and re-read it. Is it engaging and easy to read? Or are you getting annoyed by the constant use of a certain term? Be critical of your own writing and ask others for feedback on your text. 

If you’d like more guidance, the Yoast SEO plugin can help you balance the use of your keyword, synonyms, and related keywords by recognizing word forms in different languages.

If you use our Premium SEO analysis you will be able to add synonyms of your focus keyword. The plugin checks if you’ve used these synonyms in your text, but also in your meta description, introduction, subheadings, or image alt text. Moreover, our keyphrase distribution check (added in Yoast SEO 7.8) will reward you for alternately using your keyphrase and its synonyms throughout your text.

You can add multiple synonyms for your focus keyphrase in Yoast SEO Premium

You can also add related keywords in Yoast SEO Premium. By adding these the plugin is able to check whether you’re using them in your text. Your focus keyword remains the most important keyword though, and that’s why the plugin is less strict in its analysis of your related keyphrases.

related keyphrases yoast seo premium 2
You can also keyphrases that are related to your focus keyphrase in Yoast SEO Premium

One step further: make those synonyms work for you

As I said earlier, Google has come a long way since the early days of SEO. It’s now able to understand texts and take related concepts and synonyms into account. It can recognize related entities. All this to be able to serve its users the best result. And part of being the best result, is making sure your texts are easy to read. Google wants to serve readable texts.

So make sure you deliver! Think of synonyms for your keyword or keyphrase and use them to your advantage. Take a moment to come up with a few alternatives for your keyword. But also think of topics that are strongly related to your keyword. Enter these words in our SEO Premium analysis and make sure to use them in your text. You’ll notice that it becomes much easier to write a naturally flowing text when you don’t have to use your focus keyword in every other sentence. And the use of synonyms and related keyphrases helps Google understand the context of your text which increases your chances to rank!


Focus keywords remain essential. These are the words your audience is searching for. People searching for ‘candy’ will probably not click on a result with ‘delicacy’ in the text. If you search for ‘candy’ you’ll expect to see that exact word in the search results. So, exactly matching the keywords of your audience remains essential.

That being said, you can use synonyms and related concepts to write a readable text. Repeating the same keyword over and over again hurts the readability of your text, especially if you’re optimizing for a long-tail keyword. Furthermore, using synonyms and related keywords may create ranking opportunities you’d otherwise have missed. If you need help with that, Yoast SEO Premium offers different features to make sure your content is both readable and rankable.

Read more: Does readability rank? On ease of reading and SEO »

Coming up next!

14 Responses to Why you should use synonyms and related keywords

  1. Naukri
    Naukri  • 2 years ago

    Please can you tell me is it possible to use yoast seo in blogger with the help of any type of script

    • Camille Cunningham
      Camille Cunningham  • 2 years ago

      Hi Naukri! In addition to Yoast SEO for WordPress, we’ve developed our plugin for several other platforms but I’m afraid Blogger isn’t one of them. You can find more info on Yoast SEO on other platforms here: https://yoast.com/yoast-seo-platforms/

  2. Nick Freund
    Nick Freund  • 2 years ago

    Thanks for the information. Best regards, Nick

    • Camille Cunningham
      Camille Cunningham  • 2 years ago

      You’re welcome, Nick!

  3. Joseph
    Joseph  • 2 years ago

    A very helpful article. Would love to read articles about Keyword Analysis, Competitor Analysis, SEO tools, etc.
    Thank you

    • Camille Cunningham
      Camille Cunningham  • 2 years ago

      Thank you, Joseph :) You can find blogs on lots of different topics on our blog: https://yoast.com/seo-blog/

  4. Rajat Gupta
    Rajat Gupta  • 2 years ago

    Thanks for the information. But kindly guide whether lsi keywords and synonyms are one and the same thing?

    • Camille Cunningham
      Camille Cunningham  • 2 years ago

      Hi there, Rajat! Thanks for your question :) They are not quite the same, as synonyms can be seen as different words with the same meaning. To give an example, a synonym for dog is canine.

      LSI keywords are conceptually related, but don’t mean exactly the same thing. Hope this answers your question!

  5. Company URL Finder
    Company URL Finder  • 2 years ago

    thank you very much for your good article, But could you please mention some professional tools to detect keyword density? and if they are free is better?
    Thanks for your help

  6. Daniel Chege
    Daniel Chege  • 2 years ago

    Thanks for sharing insightful SEO tips, I will definitely use them to increase the google ranking to my web design company website.

    • Camille Cunningham
      Camille Cunningham  • 2 years ago

      Hi Daniel, you’re very welcome and lots of luck with your rankings!

  7. Joseph
    Joseph  • 2 years ago

    Thank you Marieke for the illuminating article. I have been using Yoast SEO Premium and it has made my work easy in using focus keyphrase and related key phrase. Yoast SEO Premium is super.

    • Edwin Toonen
      Edwin Toonen  • 2 years ago

      That’s great to hear, Joseph!