deferment vs holdup

deferment and holdup both are nouns.

Word	Noun	Adjective	Verb	Adverb
deferment	Yes	No	No	No
holdup	Yes	No	No	No

As nouns, holdup is a hypernym of deferment; that is, holdup is a word with a broader meaning than deferment:

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

Other hypernyms of deferment include delay.

deferment (noun)	holdup (noun)
act of putting off to a future time	robbery at gunpoint
	the act of delaying; inactivity resulting in something being put off until a later time