Thrown weapon (8)
(Other definitions for grenade that I've seen before include "Hand-thrown explosive" , "Small bomb thrown by hand" , "ultimate weapon" , "Small explosive device" , "One might go off" .)
(Other definitions for tomahawk that I've seen before include "Amerindian hatchet" , "its strike can be fatal" , "Native American fighting axe" , "Amerindian war-axe" , "Native American war-axe" .)