moratorium vs postponement

moratorium and postponement both are nouns.

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

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

moratorium: a legally authorized postponement before some obligation must be discharged
postponement: time during which some action is awaited

Other hypernyms of moratorium include delay, hold, time lag, wait.

moratorium (noun)	postponement (noun)
suspension of an ongoing activity	act of putting off to a future time
a legally authorized postponement before some obligation must be discharged	time during which some action is awaited