4 letter words:
keck14,
cuke10,
neck10,
reck10,
ruck10,
kern8,
knur8,
kune8,
nerk8,
neuk8,
nuke8,
renk8,
crue6,
cure6,
curn6,
ecru6,
unce6,
rune4,
3 letter words:
erk7,
euk7,
ken7,
kue7,
nek7,
uke7,
cru5,
cue5,
cur5,
ecu5,
rec5,
ruc5,
ern3,
nur3,
ren3,
rue3,
run3,
ure3,
urn3,
2 letter words:
en2,
er2,
ne2,
nu2,
re2,
un2,
ur2,