None (82 words)
body, dog, fish, mark, sun, birds, complete, ever, horse, knew, piece, problem, room, since, told, become, didn't, door, easy, friends, heard, red, sure, usually, best, better, during, however, low, ship, today, top, black, early, hours, measure, products, reached, remember, waves, covered, fast, himself, listen, several, space, toward, wind, against, five, hundred, morning, passed, pattern, step, true, busy, draw, map, money, pulled, slowly, table, voice, cold, cried, fall, ground, notice, sing, south, war, I'll, field, figure, fire, town, travel, unit, upon, English, box
Once (18 words)
color, music, questions, stand, order, across, short, happened, whole, hold, rock, numeral, vowel, north, seen, king, certain, wood