Words formed from any letters in quests, 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.

6 letters

b - subset  

e - quests  

l - tussle  

q - quests  

t - quests  

5 letters

k - tusks  

q - quest  

v - vests  

z - zests  

4 letters

q - suqs  

v - vest   vets  

x - sext  

z - zest  

3 letters

d - eds   ted   due  

k - kue   uke   tsk  

q - suq  

v - vet  

w - sew   tew   wet  

x - sex   tux