5 letter words:
erupt7,
upter7,
4 letter words:
fret7,
reft7,
terf7,
tref7,
turf7,
pert6,
puer6,
pure6,
true4,
3 letter words:
eft6,
erf6,
fer6,
fet6,
feu6,
fur6,
ref6,
tef6,
per5,
pet5,
pre5,
pur5,
put5,
rep5,
tup5,
urp5,
ret3,
rue3,
rut3,
ure3,
ute3,
2 letter words:
ef5,
fe5,
pe4,
up4,
er2,
et2,
re2,
te2,
ur2,
ut2,