procrastination vs holdup

procrastination and holdup both are nouns.

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

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

procrastination: the act of procrastinating; putting off or delaying or deferring an action to a later time
holdup: the act of delaying; inactivity resulting in something being put off until a later time

Other hypernyms of procrastination include delay.

procrastination (noun)	holdup (noun)
the act of procrastinating; putting off or delaying or deferring an action to a later time	robbery at gunpoint
slowness as a consequence of not getting around to it	the act of delaying; inactivity resulting in something being put off until a later time