3 letters:
cat, cot, cut, kat, kit, kot, kut, kyl

4 letters:
bite, byte, cate, catt, cite, coat, coit, coot, cote, cott, curt, feit, fite, heit, hite, kate, katt, kett, khat, kies, kile, kime, kirt, kise, kitt, kote, kott, kurt, kyer, kyes, kyle, kyne, lite, mite, nite, reit, rite, site, zeit, kite, kyte

5 letters:
chi's, clyte, coote, fight, hiett, hight, keitt, kites, kuhrt, light, might, night, quite, right, sight, tight, white, whyte, wight, write

6 letters:
caught, height, knight, wright

7 letters:
scheidt