dialect geography vs linguistic geography

dialect geography and linguistic geography both are nouns.

Word	Noun	Adjective	Verb	Adverb
dialect geography	Yes	No	No	No
linguistic geography	Yes	No	No	No

As nouns, dialect geography and linguistic geography are synonyms defined as:

dialect geography and linguistic geography: the study of the geographical distribution of linguistic features

dialect geography (noun)	linguistic geography (noun)
the study of the geographical distribution of linguistic features	the study of the geographical distribution of linguistic features