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7 letter words:

penguin10,

5 letter words:

genip8, unpeg8, penni7, unpen7, unpin7, ennui5,

4 letter words:

ping7, pung7, pein6, pine6, genu5, gien5, nine4,

3 letter words:

gip6, peg6, pig6, pug6, nip5, pen5, pie5, pin5, piu5, pun5, eng4, gen4, gie4, gin4, gnu4, gun4, neg4, inn3, nun3,

2 letter words:

pe4, pi4, up4, en2, in2, ne2, nu2, un2,