pomologist vs plant scientist

pomologist and plant scientist both are nouns.

Word	Noun	Adjective	Verb	Adverb
pomologist	Yes	No	No	No
plant scientist	Yes	No	No	No

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

pomologist: someone versed in pomology or someone who cultivates fruit trees
plant scientist: a biologist specializing in the study of plants

Other hypernyms of pomologist include botanist, phytologist.

pomologist (noun)	plant scientist (noun)
someone versed in pomology or someone who cultivates fruit trees	a biologist specializing in the study of plants