pistol - bullet, submarine - ?

TORPEDO
List of words for the clue pistol - bullet, submarine - ? from the crossword:
ITEM SONAR ACE GAT TRACER LUGER SEGER HANDGUN UBOAT NAUTILUS HERO WEAPON MAMA WARSHIP SUB STARTER PETE GUN PING
WordClue
BOWbullet - pistol, arrow - ?
ARROWpistol - bullet, bow - ?
STUFFthing, item
THINGobject, item
BULLETsubmarine - torpedo, pistol - ?
MAKEUPitem's composition
OBJECTitem
PELLETbullet, gunstone
PISTOLtorpedo - submarine, bullet - ?
WEAPONbow or pistol
ANTIQUEold collectable item
GARMENTsingle item of clothing
WARSHIPcorvette or submarine
PRIORITYitem's relative importance
SUBMARINEbullet - pistol, torpedo - ?
ARROWpistol - bullet, bow - ?
DETROIT... Pistons, NBA team