rod, gat (short for Gatling gun) -- edit -- htd (heat running device) -- edit -- htd is not a 'word' as the question asks for.
heater
heat
A 'gat'.
two letter word: in. un. three letter word: gnu. yin. yuk. kin. gin. gun. guy. four letter word: king. inky.
MACHINE GUN KELLY was one of the most famous GANGSTERS.
The letters in "gnu" (wildebeest) can spell the word "gun."
rifle
Sten (British submachine gun).
there isn't one.
salvo
Three
Words beginning with T and used in WW2 include:TanksTortureNot sure if Tommy Gun was used by troops in WW2, or by gangsters pre-1940s.
Get gnu gun, guy!
Roscoe