field day vs vacation

field day and vacation both are nouns.

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

As nouns, vacation is a hypernym of field day; that is, vacation is a word with a broader meaning than field day:

Other hypernyms of field day include holiday.

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

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