Depends if you're using the botanical definition or the (more common) culinary definition[0].

I would argue fruit and fruit are two words, one created semasiologically and the other created onomasiologically. Had we chosen a different pronunciation for one of those words, there would be no confusion about what fruits are.

[0] - https://en.wikipedia.org/wiki/Fruit#Botanical_vs._culinary

Yup. Though rather than say "fruit and fruit" are two words, or focusing on "definitions" (which tend to morph over time anyway), I think the more straightforward and typical approach is to just recognize that the same word can have different meanings in different contexts.

This is such a basic and universal part of language, it is a mystery to me why something so transparently clueless as "actually, tomato is a fruit" persists.