Green Party vs party

Green Party and party both are nouns.

Word	Noun	Adjective	Verb	Adverb
Green Party	Yes	No	No	No
party	Yes	No	Yes	No

As nouns, party is a hypernym of Green Party; that is, party is a word with a broader meaning than Green Party:

Other hypernyms of Green Party include political party.

Green Party (noun)	party (noun)
an environmentalist political party	an occasion on which people can assemble for social interaction and entertainment
	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

Green Party (verb)	party (verb)
	have or participate in a party