I guess if a bakery is where bakers are located, a nunnery is where the nuns are, and jewels can be found in jewelry, then chemistry is where they hide all the chemists.

Similarly, all the tomfoolers can be found hanging out in the tomfoolery, and chicanery is where you find subway gropers. (obligatory Japanese language joke, whoever gets it, yay!)

the study of molecules and other very small substances, how they relate to one another, what they are made of, etc.?

do I pass?

A poorly-justified term for romantic compatibility that does not mean that organic compounds in certain individuals are toxic to others.

In a videogame, it would probably be alchemy... or some weird character compatibility stat.

I dunno, but Red Mage seems to think he knows a lot about it.