vernacular vs bad egg

vernacular and bad egg both are nouns.

Word	Noun	Adjective	Verb	Adverb
vernacular	Yes	Yes	No	No
bad egg	Yes	No	No	No

vernacular (noun)	bad egg (noun)
the everyday speech of the people (as distinguished from literary language)	(old-fashioned slang) a bad person
a characteristic language of a particular group (as among thieves)

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