7 letter words:
nitrify13,
5 letter words:
nifty11,
rifty11,
nitry8,
4 letter words:
fini7,
firn7,
frit7,
rift7,
tiny7,
tyin7,
inti4,
trin4,
3 letter words:
fry9,
fin6,
fir6,
fit6,
rif6,
try6,
yin6,
nit3,
rin3,
rit3,
tin3,
2 letter words:
fy8,
if5,
ny5,
in2,
it2,
ti2,