Words formed from any letters in sperst plus optional blank

a -

tsars₅

u -

turps₉

upset₉

users₆

v -

verst₉

verts₉

vests₉

w -

twerp₁₁

wests₈

wrest₈

y -

tyers₇

types₁₀

tyres₇

z -

zests₁₄