life scientist vs biologist

life scientist and biologist both are nouns.

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

As nouns, life scientist and biologist are synonyms defined as:

life scientist and biologist: (biology) a scientist who studies living organisms

life scientist (noun)	biologist (noun)
(biology) a scientist who studies living organisms	(biology) a scientist who studies living organisms