holdup vs shillyshally

holdup and shillyshally both are nouns.

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

As nouns, shillyshally is a hyponym of holdup; that is, shillyshally is a word with a more specific, narrower meaning than holdup:

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

holdup (noun)	shillyshally (noun)
robbery at gunpoint	the act of procrastinating; putting off or delaying or deferring an action to a later time
the act of delaying; inactivity resulting in something being put off until a later time

holdup (verb)	shillyshally (verb)
	be uncertain and vague
	postpone doing what one should be doing