botany vs biology

botany and biology both are nouns.

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

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

Other hypernyms of botany include biological science.

botany (noun)	biology (noun)
the branch of biology that studies plants	the science that studies living organisms
all the plant life in a particular region or period	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms