postponement vs delay

postponement and delay both are nouns.

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

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

postponement: act of putting off to a future time
delay: the act of delaying; inactivity resulting in something being put off until a later time

Other hypernyms of postponement include holdup.

As nouns, postponement and delay are synonyms defined as:

Other synonyms of postponement include hold, time lag, wait.

postponement (noun)	delay (noun)
act of putting off to a future time	the act of delaying; inactivity resulting in something being put off until a later time
time during which some action is awaited	time during which some action is awaited

postponement (verb)	delay (verb)
	cause to be slowed down or delayed
	stop or halt
	slow the growth or development of
	act later than planned, scheduled, or required