WordNet sense 1 (a professional killer who uses a gun):

gun, gunman, gunslinger, shooter, hitman, triggerman, gun for hire, hired gun

WordNet sense 2 (a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States):

bomber, grinder, hero, hoagie, hoagy, sub, submarine, wedge, zep, Cuban sandwich, hero sandwich, Italian sandwich, submarine sandwich

WordNet sense 3 (any sluggish bottom-dwelling ray of the order Torpediniformes having a rounded body and electric organs on each side of the head capable of emitting strong electric discharges):

crampfish, numbfish, electric ray