holiday vs outing

holiday and outing both are nouns.

Word	Noun	Adjective	Verb	Adverb
holiday	Yes	No	Yes	No
outing	Yes	No	No	No

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

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

holiday (noun)	outing (noun)
leisure time away from work devoted to rest or pleasure	a journey taken for pleasure
a day on which work is suspended by law or custom	a day devoted to an outdoor social gathering

holiday (verb)	outing (verb)
spend or take a vacation