biologist vs scientist

biologist and scientist both are nouns.

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

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

biologist (noun)	scientist (noun)
(biology) a scientist who studies living organisms	a person with advanced knowledge of one or more sciences