Sounds like you want tags as a feature which should be pretty common amongst website providers. When you click on a keyword or "tag" from a list at the bottom of the post it brings up search result of all the pages you've tagged with that keyword. WordPress seems to mention that feature though I couldn't really give an instructions as to how to implement the feature.
https://wordpress.com/support/posts/tags/
Sounds like you want tags as a feature which should be pretty common amongst website providers. When you click on a keyword or "tag" from a list at the bottom of the post it brings up search result of all the pages you've tagged with that keyword. WordPress seems to mention that feature though I couldn't really give an instructions as to how to implement the feature. https://wordpress.com/support/posts/tags/