botany vs bush

botany and bush both are nouns.

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

As nouns, bush is a hyponym of botany; that is, bush is a word with a more specific, narrower meaning than botany:

botany (noun)	bush (noun)
the branch of biology that studies plants	hair growing in the pubic area
all the plant life in a particular region or period	dense vegetation consisting of stunted trees or bushes
	a large wilderness area
	a low woody perennial plant usually having several major stems

botany (adjective)	bush (adjective)
	not of the highest quality or sophistication

botany (verb)	bush (verb)
	provide with a bushing