holdup vs stickup

holdup and stickup both are nouns.

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

As nouns, holdup and stickup are synonyms defined as:

Other synonyms of holdup include armed robbery, heist.

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