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6 letter words:

frozen18,

5 letter words:

forze17, froze17, zoner14, freon8,

4 letter words:

zero13, zone13, fern7, foen7, fone7, fore7, froe7, orfe7, oner4, rone4,

3 letter words:

fez15, rez12, erf6, fen6, fer6, foe6, fon6, for6, fro6, nef6, orf6, ref6, eon3, ern3, nor3, one3, ore3, ren3, reo3, roe3,

2 letter words:

zo11, ef5, fe5, of5, en2, er2, ne2, no2, oe2, on2, or2, re2,