bullet - pistol, torpedo - ?

SUBMARINE
WordClue
BOWbullet - pistol, arrow - ?
ARROWpistol - bullet, bow - ?
BULLETsubmarine - torpedo, pistol - ?
PELLETbullet, gunstone
PISTOLtorpedo - submarine, bullet - ?
WEAPONbow or pistol
TORPEDOpistol - bullet, submarine - ?
BOWbullet - pistol, arrow - ?
VESTbulletproof or life