systematist vs life scientist

systematist and life scientist both are nouns.

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

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

systematist: a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior
life scientist: (biology) a scientist who studies living organisms

Other hypernyms of systematist include biologist.

systematist (noun)	life scientist (noun)
a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior	(biology) a scientist who studies living organisms
an organizer who puts things in order