play hooky vs vernacular

play hooky is not a noun while vernacular is a noun.

Word	Noun	Adjective	Verb	Adverb
play hooky	No	No	Yes	No
vernacular	Yes	Yes	No	No

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

play hooky (adjective)	vernacular (adjective)
	being or characteristic of or appropriate to everyday language

play hooky (verb)	vernacular (verb)
play truant from work or school