6 letter words:
ferrum11,
frenum11,
murmur10,
rummer10,
5 letter words:
femur10,
fumer10,
murre7,
rumen7,
rerun5,
4 letter words:
fume9,
mumu8,
enuf7,
fern7,
menu6,
mure6,
murr6,
neum6,
ruer4,
rune4,
3 letter words:
fem8,
mem7,
mum7,
umm7,
fen6,
fer6,
feu6,
fun6,
fur6,
ref6,
emu5,
men5,
mun5,
rem5,
rum5,
ern3,
err3,
rue3,
run3,
urn3,
2 letter words:
mm6,
ef5,
fe5,
em4,
me4,
mu4,
um4,
en2,
er2,
ne2,
nu2,
re2,
un2,