9 letter words:
rumrunner11,
6 letter words:
runner6,
5 letter words:
murre7,
numen7,
rumen7,
rerun5,
4 letter words:
menu6,
mure6,
murr6,
neum6,
ruer4,
rune4,
3 letter words:
emu5,
men5,
mun5,
rem5,
rum5,
ern3,
err3,
nun3,
rue3,
run3,
urn3,
2 letter words:
em4,
me4,
mu4,
um4,
en2,
er2,
ne2,
nu2,
re2,
un2,