party vs fatigue party

party and fatigue party both are nouns.

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

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

party (noun)	fatigue party (noun)
an occasion on which people can assemble for social interaction and entertainment	a group of soldiers on fatigue duty
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)	fatigue party (verb)
have or participate in a party