Thompson submachine-gun /tom(p)ˈsən sub-mə-shēnˈgun/

A tommy gun (also Thompson gun)

• backpack
• backpacked
• backpacker
• backpackers
• backpacking
• backpackings
• backpacks
• back pass
• back passage
• back passages
• back passes
• back pay
• back-pedal
• back-pedalled
• back-pedalling
• back-pedals
• backpiece
• backpieces
• backplate
• back pressure
• back-projection
• back-projections
• backra
• backras
• back rest