brier patch vs botany

brier patch and botany both are nouns.

Word	Noun	Adjective	Verb	Adverb
brier patch	Yes	No	No	No
botany	Yes	No	No	No

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

Other hypernyms of brier patch include flora, vegetation.

brier patch (noun)	botany (noun)
tangled mass of prickly plants	the branch of biology that studies plants
	all the plant life in a particular region or period