Words formed from any letters in proficiences plus optional blank

f -

spiffier₁₇

g -

speccing₂₀

speering₁₄

speiring₁₄

spiering₁₄

spongier₁₄

m -

specimen₁₈

spermine₁₅

o -

snoopier₁₂

spoonier₁₂

p -

snippier₁₅

s -

spencers₁₅

t -

softener₁₂

spitfire₁₄

terpenic₁₅

tropines₁₂

u -

unifiers₁₃

v -

verifies₁₅

vineries₁₃

viperine₁₆

w -

wicopies₁₇

wineries₁₂

x -

spinifex₂₂

y -

syncopic₂₀

z -

zirconic₂₄