Words formed from any letters in passbooks plus optional blank

e -

spake₁₂

speak₁₂

spoke₁₂

f -

spoof₁₁

i -

spiks₁₂

l -

spool₉

m -

spams₁₁

spasm₁₁

n -

spank₁₃

spans₉

spoon₉

r -

spark₁₂

spars₈

spoor₈

t -

spats₈

spots₈

stabs₈

stoas₅

stobs₈

stook₉

stoop₈

stops₈

stoss₅

taboo₈

tasks₉

topos₈

u -

subas₉

w -

swabs₁₁

swaps₁₁

swobs₁₁

swoop₁₁

swops₁₁

wasps₁₁

woops₁₁

y -

spays₁₀

sysop₁₀

yapok₁₄

z -

zooks₁₈