party vs dinner party

party and dinner party both are nouns.

Word	Noun	Adjective	Verb	Adverb
party	Yes	No	Yes	No
dinner party	Yes	No	No	No

As nouns, dinner party is a hyponym of party; that is, dinner party is a word with a more specific, narrower meaning than party:

party (noun)	dinner party (noun)
an occasion on which people can assemble for social interaction and entertainment	a party of people assembled to have dinner together
a gathering of people for pleasure
an organization to gain political power
a band of people associated temporarily in some activity
a person involved in legal proceedings

party (verb)	dinner party (verb)
have or participate in a party