phytologist vs life scientist

phytologist and life scientist both are nouns.

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

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

Other hypernyms of phytologist include biologist.

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