postponement vs interruption

postponement and interruption both are nouns.

Word	Noun	Adjective	Verb	Adverb
postponement	Yes	No	No	No
interruption	Yes	No	No	No

As nouns, interruption is a hypernym of postponement; that is, interruption is a word with a broader meaning than postponement:

postponement: time during which some action is awaited
interruption: a time interval during which there is a temporary cessation of something

Other hypernyms of postponement include break, intermission, pause, suspension.

postponement (noun)	interruption (noun)
act of putting off to a future time	an act of delaying or interrupting the continuity
time during which some action is awaited	some abrupt occurrence that interrupts an ongoing activity
	a time interval during which there is a temporary cessation of something