rift vs scissure

rift and scissure both are nouns.

Word	Noun	Adjective	Verb	Adverb
rift	Yes	No	No	No
scissure	Yes	No	No	No

As nouns, scissure is a hypernym of rift; that is, scissure is a word with a broader meaning than rift:

Other hypernyms of rift include cleft, crack, crevice, fissure.

rift (noun)	scissure (noun)
a personal or social separation (as between opposing factions)	a long narrow cleft
a narrow fissure in rock
a gap between cloud masses