Words formed from any letters in fourfold plus optional blank

n -

undo₇

p -

updo₉

s -

sord₅

soul₆

sour₅

surd₆

surf₈

udos₆

urds₆

t -

toff₁₀

tofu₈

told₆

tolu₆

tool₅

toro₄

tour₅

trod₅

tuff₁₁

turd₆

turf₈

w -

wold₉

wolf₁₁

wood₈

woof₁₀

wool₈

word₈

y -

your₇