Words formed from any letters in underwhelms plus optional blank

a -

wheelman₁₈

c -

wrenched₁₈

wrenches₁₇

e -

wheedles₁₅

wheelers₁₄

wheelmen₁₈

i -

wideners₁₃

wielders₁₃

o -

wormseed₁₅

worsened₁₃

t -

wrestled₁₃

wuthered₁₅