Bringing it back to SEO-specifics,

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“Entities can be described by keywords, but can also be described by images, sounds, smells, feelings, and concepts. (Think of the sound of a train station – it offers a somewhat universal concept to anyone who can hear it without the need for a keyword.) A unified index based on entity concepts eliminates the need for Google to sort through the vast morass of changing languages and keywords in all the languages of the world. Instead, they can sort their index based on these unifying concepts (entities), and then branch out from there into different languages as needed.”

Cindy explains that both domains (traditionally cambodia number data with indexing) and the brands that run them can be considered entities. "Entity-based indexing is what would allow Google to group all of a brand's international websites as one entity, and switch to the appropriate website for the searcher based on their individual country and language."

So, what does any of this have to do with our favorite SERP features? Well, all of the suggested terms included are a direct result of Google’s endless topic analysis and sorting. We may not be privy to every entity Google scrapes, but we can certainly take a cue from how they choose to express the final product on the SERP.

How we made magic
To map the overlap in our specific query space, we took a highly scientific word bag approach. Working at a SERP-by-SERP level of analysis, we scooped each feature’s suggestions into its own bag, filtered out any stop words, and then compared the suggestions from one bag to another, finding and calculating a match as we went.

So, for example, we would evaluate all PAA queries on a SERP against all related searches on the same SERP. Each PAA suggestion got its own bag, as did each related search, and we removed the search term from all bags. If any remaining words in both bags matched, we counted that as an overlap, divided it by the total number of possible overlaps, and got the total entity overlap between those features. Phew!