Is this really a thesaurus feature built into the search bar, or the results are just showing words based on what letters are being searched for?
I can see how this would be confusing if it’s really an unlabled rogue thesaurus engine running in what looks like just a regular search bar, while that could be useful but probably best to be labled as a thesaurus and be separate from search system depending on the language.
Usually best to consult with the pigeons for synonyms:
