I’m assuming you mean 3+ letters. Pore, rope, late, teal, tea, eat, ate, pale, plate, tape, tap, pat, lop, lope, pole, pot, top, rot, tor, tore, tare, tear, ear, pear, part, art, pint, pit, tip, tit, trite, lite, per, rep, trip, trial, lier, liar, lie, tie, port, intro, into, treat…I can keep going….