vernacular vs poor white trash

vernacular and poor white trash both are nouns.

Word	Noun	Adjective	Verb	Adverb
vernacular	Yes	Yes	No	No
poor white trash	Yes	No	No	No

vernacular (noun)	poor white trash (noun)
the everyday speech of the people (as distinguished from literary language)	(slang) an offensive term for White people who are impoverished
a characteristic language of a particular group (as among thieves)

vernacular (adjective)	poor white trash (adjective)
being or characteristic of or appropriate to everyday language