13 letter words:
nonconcurring18,
10 letter words:
concurring15,
9 letter words:
occurring14,
nonconcur13,
8 letter words:
crooning11,
nonunion8,
7 letter words:
conning10,
corning10,
couring10,
cunning10,
curring10,
inconnu9,
unicorn9,
grunion8,
nooning8,
ronning8,
running8,
noniron7,
runnion7,
6 letter words:
concur10,
congou9,
coning9,
cooing9,
coring9,
curing9,
nuncio8,
gonion7,
onning7,
rigour7,
rognon7,
runrig7,
urning7,
ronion6,
5 letter words:
conic9,
croci9,
occur9,
cogon8,
coign8,
congo8,
corgi8,
cuing8,
incog8,
orgic8,
conin7,
corni7,
corno7,
cornu7,
croon7,
cruor7,
curio7,
incur7,
orcin7,
roric7,
runic7,
giron6,
groin6,
guiro6,
rigor6,
ruing6,
unrig6,
inrun5,
inurn5,
ninon5,
onion5,
ronin5,
union5,
4 letter words:
coco8,
croc8,
crog7,
cion6,
coin6,
coir6,
coni6,
conn6,
coon6,
corn6,
cour6,
curn6,
curr6,
icon6,
unci6,
unco6,
uric6,
ginn5,
girn5,
giro5,
girr5,
goon5,
goor5,
gori5,
grin5,
gurn5,
ingo5,
nong5,
ring5,
rong5,
rung5,
inro4,
iron4,
noir4,
noni4,
noon4,
nori4,
noun4,
nurr4,
ourn4,
roin4,
roon4,
ruin4,
3 letter words:
cig6,
cog6,
con5,
coo5,
cor5,
cru5,
cur5,
orc5,
roc5,
ruc5,
gin4,
gio4,
gnu4,
gon4,
goo4,
gor4,
gun4,
gur4,
nog4,
rig4,
rug4,
inn3,
ion3,
non3,
noo3,
nor3,
nun3,
nur3,
ono3,
oon3,
oor3,
our3,
rin3,
roo3,
run3,
uni3,
urn3,
2 letter words:
gi3,
go3,
gu3,
ug3,
in2,
io2,
no2,
nu2,
oi2,
on2,
oo2,
or2,
ou2,
un2,
ur2,