Droop rhymes with:
drupe, croup, drupe, group, groupe, grupe, intergroup, regroup, roop, roope, roupe, rupe, stroop, stroope, stroup, stroupe, throop, troop, troup, troupe
Droop sounds like:
darby, darpa, dauterive, deharbe, derby, derive, diatribe, dorf, dorff, drab, drape, drapeau, dravo, drip, drive, drive-by, driveway, droopy, drop, drop-off, dropoff, drove, drub, drupe, durfee, durfey, dwarf