There are several synonyms commonly used to describe an "armed hold-up". Some of the common and more appropriate ones are robbery, heist, stick-up, and theft. These terms refer to the same kind of crime but with different degrees of force used in holding up the victim. "Robbery" is the broadest term that can apply to any kind of theft that involves force or threat. "Heist" and "stick-up" are more specific terms that suggest a violent or organized crime. Finally, "theft" is the most general term that can be used as a synonym for "armed hold-up," describing the theft of property by force, intimidation, or violence.