decimator, devastator

DESTROYER
WordClue
VANDALdestroyer
BREAKERwrecker, destroyer
WRECKERdestroyer, vandal
DEMOLISHERdestroyer, breaker
ELIMINATORdestroyer, annihilator
SYSTEMdecimal or urinary
RESOLUTIONdecision