prorogation vs discontinuance

prorogation and discontinuance both are nouns.

Word	Noun	Adjective	Verb	Adverb
prorogation	Yes	No	No	No
discontinuance	Yes	No	No	No

As nouns, discontinuance is a hypernym of prorogation; that is, discontinuance is a word with a broader meaning than prorogation:

prorogation: discontinuation of the meeting (of a legislative body) without dissolving it
discontinuance: the act of discontinuing or breaking off; an interruption (temporary or permanent)

Other hypernyms of prorogation include discontinuation.

prorogation (noun)	discontinuance (noun)
discontinuation of the meeting (of a legislative body) without dissolving it	the act of discontinuing or breaking off; an interruption (temporary or permanent)