West Saxon vs Southwestern

West Saxon and Southwestern both are nouns.

Word	Noun	Adjective	Verb	Adverb
West Saxon	Yes	No	No	No
Southwestern	Yes	No	No	No

As nouns, West Saxon and Southwestern are synonyms defined as:

West Saxon and Southwestern: a dialect of Middle English, spoken in the area west of Sussex and south and southwest of the Thames

West Saxon (noun)	Southwestern (noun)
a literary dialect of Old English	a dialect of Middle English, spoken in the area west of Sussex and south and southwest of the Thames
a dialect of Middle English, spoken in the area west of Sussex and south and southwest of the Thames
an inhabitant of Wessex