botany vs scrub

botany and scrub both are nouns.

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

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

botany (noun)	scrub (noun)
the branch of biology that studies plants	the act of cleaning a surface by rubbing it with a brush and soap and water
all the plant life in a particular region or period	dense vegetation consisting of stunted trees or bushes

botany (adjective)	scrub (adjective)
	(of domestic animals) not selectively bred

botany (verb)	scrub (verb)
	wash thoroughly
	clean with hard rubbing
	postpone indefinitely or annul something that was scheduled