The Greek term "rump kw’los" matches the English term "rump"

other greek words that include "rump" : english :
trumpet sa’lpigka, trompe’ta trumpet
other greek words that include "kw’los" : english :
anus kw’los, prwkto’s anus
arse kw’los, prwkto’s arse
backside kw’los backside