vernacular vs good egg

vernacular and good egg both are nouns.

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

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

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