acorn, acrid, adorn, air, arc, aria, arid, cairn, canard, car, card, cord, corn, darn, dinar, draconian, drain, inroad, iron, nadir, nor, oar, ocarina, orc, orca, ordain, radian, radio, radon, raid, rain, ran, rancid, rand, ria, rid, rind, road, rod