vernacular vs piece of tail

vernacular and piece of tail both are nouns.

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

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

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