5 letter words:
grufe9,
4 letter words:
frug8,
fret7,
reft7,
terf7,
tref7,
turf7,
gert5,
grue5,
tegu5,
trug5,
urge5,
true4,
3 letter words:
feg7,
fug7,
eft6,
erf6,
fer6,
fet6,
feu6,
fur6,
ref6,
tef6,
erg4,
get4,
gue4,
gur4,
gut4,
reg4,
rug4,
teg4,
tug4,
ret3,
rue3,
rut3,
ure3,
ute3,
2 letter words:
ef5,
fe5,
gu3,
ug3,
er2,
et2,
re2,
te2,
ur2,
ut2,