vernacular vs old man

vernacular and old man both are nouns.

Word	Noun	Adjective	Verb	Adverb
vernacular	Yes	Yes	No	No
old man	Yes	No	No	No

vernacular (noun)	old man (noun)
the everyday speech of the people (as distinguished from literary language)	an informal term for your father
a characteristic language of a particular group (as among thieves)	a man who is very old
	a familiar term of address for a man
	(slang) boss
	aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe

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