vernacular vs bay window

vernacular and bay window both are nouns.

Word	Noun	Adjective	Verb	Adverb
vernacular	Yes	Yes	No	No
bay window	Yes	No	No	No

vernacular (noun)	bay window (noun)
the everyday speech of the people (as distinguished from literary language)	a window that sticks out from the outside wall of a house
a characteristic language of a particular group (as among thieves)	slang for a paunch

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