Coplan rhymes with:
koplan, koplan, caplan, chaplain, chaplan, chaplin, discipline, kaplain, kaplan, koplan, pomplun
Coplan sounds like:
cableone, caplan, caplin, cephalon, chaplain, chaplan, chaplin, choplin, cipollone, civilian, cofflin, copelan, copelin, coplen, coplin, coppolino, couvillion, couvillon