botanist vs life scientist

botanist and life scientist both are nouns.

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

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

Other hypernyms of botanist include biologist.

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