reunion vs jointure

reunion and jointure both are nouns.

Word	Noun	Adjective	Verb	Adverb
reunion	Yes	No	No	No
jointure	Yes	No	No	No

As nouns, jointure is a hypernym of reunion; that is, jointure is a word with a broader meaning than reunion:

Other hypernyms of reunion include conjugation, unification, union, uniting.

reunion (noun)	jointure (noun)
the act of coming together again	the act of making or becoming a single unit
a party of former associates who have come together again	(law) an estate secured to a prospective wife as a marriage settlement in lieu of a dower