Word niffs with one letter changed

Letter on position 1 (n) changed: 7 words

Letter on position 2 (i) changed: 2 words

naffs
nuffs

Letter on position 3 (f) changed: 1 word

niefs

Letter on position 4 (f) changed: 1 word

nifes

Letter on position 5 (s) changed: 1 word

niffy