I think your edit points out the reality: what we call "bitter" covers a wide range of different tastes and we have at least 25 different receptors that are con

I think your edit points out the reality: what we call "bitter" covers a wide range of different tastes and we have at least 25 different receptors that are considered "bitter". https://en.wikipedia.org/wiki/Taste_receptor https://en.wikipedia.org/wiki/Taste_receptor