vacation vs field day

vacation and field day both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacation	Yes	No	Yes	No
field day	Yes	No	No	No

As nouns, field day is a hyponym of vacation; that is, field day is a word with a more specific, narrower meaning than vacation:

Other hyponyms of vacation include half-term, vac, vacay, outing, picnic, honeymoon, paid vacation, winter break.

vacation (noun)	field day (noun)
the act of making something legally void	a day for outdoor athletic competition
leisure time away from work devoted to rest or pleasure	a day devoted to an outdoor social gathering
	(military) a day for military exercises and display
	a time of unusual pleasure and success

vacation (verb)	field day (verb)
spend or take a vacation