3 letters:
b.s, bes, c.s, d.s, p.s, tia, tis, v.s, t.s

4 letters:
bees, c.'s, d.'s, dees, fees, geez, he's, jeez, keys, lees, p.'s, peas, reis, seas, sees, taos, teak, teal, team, teat, teed, teem, teen, tier, ties, toes, toys, twos, v.'s, t.'s, teas

5 letters:
keyes, knees, lee's, pease, seize, she's, teach, teams, teens, teeth, these, trees, two's, tease

6 letters:
cheese, teague, team's, teased, teaser, teethe, wheeze