botanist vs biologist

botanist and biologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
botanist	Yes	No	No	No
biologist	Yes	No	No	No

As nouns, biologist is a hypernym of botanist; that is, biologist is a word with a broader meaning than botanist:

Other hypernyms of botanist include life scientist.

botanist (noun)	biologist (noun)
a biologist specializing in the study of plants	(biology) a scientist who studies living organisms