I'm pretty much with @Stan Fresh on this one, as there's no need, and more importantly, nothing gained, to play coy about who's what.
I will however add that if your players feel the need to ask, you've failed in your description of the opposition.
"Five guards by the gate" would almost certainly be minions, while "a burly guy with a leather jacket, a mohawk and expensive looking blaster carbine" is quite likely a rival/nemesis (this distinction is less important).