None (81 words)
either, ice, metal, sleep, solve, son, baby, factors, floor, hill, jumped, result, ride, already, bed, century, everything, instead, outside, phrase, soil, case, copy, free, hope, laughed, nation, quite, spring, themselves, type, bright, consonant, dictionary, everyone, lake, method, section, temperature, within, age, although, amount, broken, hair, moment, pounds, tiny, build, gold, lot, middle, natural, possible, stone, angle, bear, cat, count, sail, smiled, someone, wonder, Africa, bottom, fight, fraction, hole, let's, melody, poor, trip, couldn't, died, dress, exactly, fingers, iron, remain, catch, climbed
Once (18 words)
speak, village, pushed, snow, buy, tall, lead, scale, act, milk, quiet, rolled, speed, French, beat, surprise, continued, else