life scientist vs scientist

life scientist and scientist both are nouns.

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

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

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