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Answer:
Common words: ahoy, airy, bay, BIOGRAPHY, boy, bray, by, gory, gray, gyro, hairy, harpy, hay, pay, pray, pry, ray, ropy, yap, yip, yoga, yogi.
All words: aby, ahoy, airy, ay, bay, BIOGRAPHY, bogy, boy, boyar, bray, by, gaby, gapy, goby, gory, grapy, gray, gripy, gyp, gyri, gyro, hairy, harpy, hay, hoagy, hoary, hoy, hoya, hyp, hypo, orby, oy, pay, payor, pogy, porgy, pray, pry, pya, ray, ropy, rya, ya, yagi, yah, yap, yar, yip, yo, yob, yoga, yogh, yogi.