phonologist vs linguist

phonologist and linguist both are nouns.

Word	Noun	Adjective	Verb	Adverb
phonologist	Yes	No	No	No
linguist	Yes	No	No	No

As nouns, linguist is a hypernym of phonologist; that is, linguist is a word with a broader meaning than phonologist:

Other hypernyms of phonologist include linguistic scientist.

phonologist (noun)	linguist (noun)
a specialist in phonology	a person who speaks more than one language
	a specialist in linguistics