vacation vs half-term

vacation and half-term both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacation	Yes	No	Yes	No
half-term	Yes	No	No	No

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

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

vacation (noun)	half-term (noun)
the act of making something legally void	a short vacation about halfway through a school term
leisure time away from work devoted to rest or pleasure

vacation (verb)	half-term (verb)
spend or take a vacation