dine vs diner

dine is not a noun while diner is a noun.

Word	Noun	Adjective	Verb	Adverb
dine	No	No	Yes	No
diner	Yes	No	No	No

dine (noun)	diner (noun)
	a passenger car where food is served in transit
	a restaurant that resembles a dining car
	a person eating a meal (especially in a restaurant)

dine (verb)	diner (verb)
have supper; eat dinner
give dinner to; host for dinner