picnic vs vacation

picnic and vacation both are nouns.

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

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

Other hypernyms of picnic include holiday.

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

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