Yoast Partners with SEMRush to Bring Related Keyphrases Feature in the Plugin
https://yoast.comThis integration helps you find related keyphrases for your focus keyphrases in Yoast SEO. Before you get access to the related keyphrases, you will need to connect SEMrush to Yoast SEO.
Both free and premium Yoast SEO users have access to the SEMrush related keyphrases. However, only premium users can add a related keyphrase from the list to their post with just one click. Using a free SEMrush account will allow you to make up to 10 requests for related keyphrases per day. To get full access to the SEMrush tools, you will need to upgrade your SEMrush account.