good egg vs vernacular

good egg and vernacular both are nouns.

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

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

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