Wikipedia is a great source for finding entities. I've been using it without even realizing that "entity SEO" exists. Lol!

I call this semantics. If I'm writing about Paris, I'd include words like the capital city of France, City of Love, City of Effile Tower etc.

This makes it easier for search engines to understand the context of the page & exactly know what the page is about.

I'm 100% sure Paris's Wikipedia page would include all these words.