Yes. A sub machine gun is a machine gun that fires pistol rounds and Uzis are 9mm.
A sub-machine gun fires pistol cartridges. A machine gun fires rifle rounds.
The .45 Thompson sub-machine gun and M3 sub machine gun (grease gun) were used in WW2, Korea, and Vietnam War. A sub-machine gun is called a SUB machine gun because it uses "pistol" ammunition. The M3 sub-machinegun looked exactly like a grease gun; hence the name.
Sub machine gun
If you are referring to the present, today's most powerful sub-machine gun is the H&K UMP .45 cal sub-machine gun, or the Kriss Vector SMG. if you are referring to the past however then its undeniably the Tommy Gun. also a .45 cal sub-machine gun.
No
@1915
SMG
sub-machine gun
Sub-Coelum was created in 1893.
Sub Command was created in 2001.
Sub Hunt was created in 1982.