vernacular vs cert

vernacular and cert both are nouns.

Word	Noun	Adjective	Verb	Adverb
vernacular	Yes	Yes	No	No
cert	Yes	No	No	No

vernacular (noun)	cert (noun)
the everyday speech of the people (as distinguished from literary language)	an absolute certainty
a characteristic language of a particular group (as among thieves)

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