buy it vs vernacular

buy it is not a noun while vernacular is a noun.

Word	Noun	Adjective	Verb	Adverb
buy it	No	No	Yes	No
vernacular	Yes	Yes	No	No

buy it (noun)	vernacular (noun)
	the everyday speech of the people (as distinguished from literary language)
	a characteristic language of a particular group (as among thieves)

buy it (adjective)	vernacular (adjective)
	being or characteristic of or appropriate to everyday language

buy it (verb)	vernacular (verb)
be killed or die