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5 letter words:

roton5,

4 letter words:

onto4, oont4, ront4, roon4, root4, roto4, toon4, torn4, toro4, tron4,

3 letter words:

noo3, nor3, not3, ono3, oon3, oor3, oot3, ort3, roo3, rot3, ton3, too3, tor3,

2 letter words:

no2, on2, oo2, or2, to2,