vacation vs picnic

vacation and picnic both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacation	Yes	No	Yes	No
picnic	Yes	No	Yes	No

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

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

vacation (noun)	picnic (noun)
the act of making something legally void	any undertaking that is easy to do
leisure time away from work devoted to rest or pleasure	any informal meal eaten outside or on an excursion
	a day devoted to an outdoor social gathering

vacation (verb)	picnic (verb)
spend or take a vacation	eat alfresco, in the open air