13 letter words:
sleeplessness15,
9 letter words:
sleepless11,
senseless9,
8 letter words:
lensless8,
7 letter words:
pensees9,
spenses9,
spleens9,
lessees7,
lessens7,
6 letter words:
pensee8,
sepses8,
sleeps8,
speels8,
spells8,
spense8,
spleen8,
lenses6,
lessee6,
lessen6,
nesses6,
selles6,
senses6,
snells6,
5 letter words:
epees7,
neeps7,
peels7,
peens7,
peles7,
penes7,
seeps7,
sleep7,
speel7,
spell7,
esnes5,
esses5,
lenes5,
lense5,
leses5,
seels5,
selle5,
sells5,
sense5,
snell5,
4 letter words:
epee6,
neep6,
peel6,
peen6,
pees6,
pele6,
pens6,
seep6,
eels4,
ells4,
else4,
eses4,
esne4,
lees4,
lens4,
less4,
ness4,
seel4,
seen4,
sees4,
sell4,
sels4,
sene4,
3 letter words:
pee5,
pen5,
pes5,
eel3,
ell3,
els3,
ens3,
ess3,
lee3,
les3,
nee3,
see3,
sel3,
sen3,
2 letter words:
pe4,
el2,
en2,
es2,
ne2,