Words formed from any letters in buy, plus optional blank

The value of the blank, or of an existing letter already on the game board, is shown at the start of each line.

4 letters

o - buoy  

r - bury   ruby  

s - busy   buys  

p - upby  

3 letters

a - aby   bay  

b - bub   buy  

c - cub  

d - bud   dub  

e - bey   bye  

f - fub  

g - bug   guy  

h - hub  

k - yuk  

m - bum   yum  

n - bun   nub  

o - boy   yob   you  

p - pub   yup  

r - bur   rub   urb  

s - bus   sub   bys  

t - but   tub  

u - buy  

y - buy