dialectology vs linguistics

dialectology and linguistics both are nouns.

Word	Noun	Adjective	Verb	Adverb
dialectology	Yes	No	No	No
linguistics	Yes	No	No	No

As nouns, linguistics is a hypernym of dialectology; that is, linguistics is a word with a broader meaning than dialectology:

dialectology: the branch of philology that is devoted to the study of dialects
linguistics: the humanistic study of language and literature

Other hypernyms of dialectology include philology.

dialectology (noun)	linguistics (noun)
the branch of philology that is devoted to the study of dialects	the scientific study of language
	the humanistic study of language and literature