6 letter words:
nipter8,
pterin8,
5 letter words:
inept7,
nepit7,
piert7,
prent7,
print7,
repin7,
ripen7,
tripe7,
inert5,
inter5,
niter5,
nitre5,
trine5,
4 letter words:
pein6,
peni6,
pent6,
peri6,
pern6,
pert6,
pier6,
piet6,
pine6,
pint6,
pirn6,
ripe6,
ript6,
trip6,
nite4,
rein4,
rent4,
rine4,
rite4,
tern4,
tier4,
tine4,
tire4,
trie4,
trin4,
3 letter words:
nep5,
nip5,
pen5,
per5,
pet5,
pie5,
pin5,
pir5,
pit5,
pre5,
rep5,
rip5,
tip5,
ern3,
ire3,
net3,
nie3,
nit3,
rei3,
ren3,
ret3,
rin3,
rit3,
ten3,
tie3,
tin3,
2 letter words:
pe4,
pi4,
en2,
er2,
et2,
in2,
it2,
ne2,
re2,
te2,
ti2,