prolongation vs continuance

prolongation and continuance both are nouns.

Word	Noun	Adjective	Verb	Adverb
prolongation	Yes	No	No	No
continuance	Yes	No	No	No

As nouns, continuance is a hypernym of prolongation; that is, continuance is a word with a broader meaning than prolongation:

Other hypernyms of prolongation include continuation.

prolongation (noun)	continuance (noun)
the act of prolonging something	the act of continuing an activity without interruption
amount or degree or range to which something extends	the property of enduring or continuing in time
the consequence of being lengthened in duration	the period of time during which something continues