piece of tail vs patois

piece of tail and patois both are nouns.

Word	Noun	Adjective	Verb	Adverb
piece of tail	Yes	No	No	No
patois	Yes	No	No	No

piece of tail (noun)	patois (noun)
slang for sexual intercourse	a regional dialect of a language (especially French); usually considered substandard
	a characteristic language of a particular group (as among thieves)