pentamerous vs botany

pentamerous is not a noun while botany is a noun.

Word	Noun	Adjective	Verb	Adverb
pentamerous	No	Yes	No	No
botany	Yes	No	No	No

pentamerous (noun)	botany (noun)
	the branch of biology that studies plants
	all the plant life in a particular region or period

pentamerous (adjective)	botany (adjective)
divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members