leisure vs vacation

leisure and vacation both are nouns.

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

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

Other hyponyms of leisure include free time, spare time, holiday, playday, playtime.

leisure (noun)	vacation (noun)
freedom to choose a pastime or enjoyable activity	the act of making something legally void
time available for ease and relaxation	leisure time away from work devoted to rest or pleasure

leisure (verb)	vacation (verb)
	spend or take a vacation