grammarian vs linguist

grammarian and linguist both are nouns.

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

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

Other hypernyms of grammarian include linguistic scientist.

grammarian (noun)	linguist (noun)
a linguist who specializes in the study of grammar and syntax	a person who speaks more than one language
	a specialist in linguistics