patois vs poor white trash

patois and poor white trash both are nouns.

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

patois (noun)	poor white trash (noun)
a regional dialect of a language (especially French); usually considered substandard	(slang) an offensive term for White people who are impoverished
a characteristic language of a particular group (as among thieves)