piece of tail vs vernacular

piece of tail and vernacular both are nouns.

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

piece of tail (noun)	vernacular (noun)
slang for sexual intercourse	the everyday speech of the people (as distinguished from literary language)
	a characteristic language of a particular group (as among thieves)

piece of tail (adjective)	vernacular (adjective)
	being or characteristic of or appropriate to everyday language