brushwood vs botany

brushwood and botany both are nouns.

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

As nouns, botany is a hypernym of brushwood; that is, botany is a word with a broader meaning than brushwood:

Other hypernyms of brushwood include flora, vegetation.

brushwood (noun)	botany (noun)
a dense growth of bushes	the branch of biology that studies plants
the wood from bushes or small branches	all the plant life in a particular region or period