use '?' for JOKER (blank)

From letters N, O, O, K, Y  I made following words

5 letter words

nooky[12]

4 letter words

nook[8]

3 letter words

yok[10], yon[6], noo[3], ono[3]

2 letter words

oy[5], yo[5], no[2], on[2]