plant scientist vs biologist

plant scientist and biologist both are nouns.

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

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

Other hypernyms of plant scientist include life scientist.

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