Munitorum*



There’s also a few others terms:



Veterans: Those can sometimes be considered stormtroopers as they are hardened warriors of the Imperial Guards. They don’t always recieve better equipment than their peer; but it happens. They also serve as a recruitment pool for regimental stormtroopers



Grenadiers: Those are stormtroopers that belong to a Imperial Guard regiment rather than to another institution of the Imperium. Kasrkin belongs to this category; so does DK grenadiers and many others carapace clad; hellgun wielding troops that operate within a regiment.



Inquisitorial Stormtrooper: Those are the most elite of the Tempestus Scion (who are already peak humans so..)

They are the private army of the Inquisition; guarding Inquisitorial facilities; ships; prisons; and acting as their shock troops to take down large cults and what’s not. Still not as good as Astartes; but let’s be honest: if a Chaos Space Marine barged in an inquisitorial fortress like an arrogant morron; he might kill one or two of these; but he’ll quickly get his face melted by a hellgun blast



Some orhers organizations might have their own versions of stormtrooper but overall those are the main ones