attendant vs partygoer

attendant and partygoer both are nouns.

Word	Noun	Adjective	Verb	Adverb
attendant	Yes	Yes	No	No
partygoer	Yes	No	No	No

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

Other hyponyms of attendant include conventioneer, symposiast.

attendant (noun)	partygoer (noun)
an event or situation that happens at the same time as or in connection with another	someone who is attending a party
someone who waits on or tends to or attends to the needs of another
a person who is present and participates in a meeting

attendant (adjective)	partygoer (adjective)
being present (at a meeting or event, etc.)
occurring with or following as a consequence