vernacular vs buy it

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

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

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

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

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