bed, bell, bled, blue, bluer, bode, bolder, bore, bored, boulder, bred, bulldoze, bulldozer, dell, doe, doer, dole, double, doubler, doze, due, duel, duller, ell, euro, led, lobe, lobed, lode, lore, louder, lure, lured, ode, older, ore, red, redo, robe, robed, rode, roe, role, rolled, rouble, rude, rue, rued, rule, ruled, zebu, zero