Words formed from any letters in implausibility plus optional blank

c -

ultimacy₁₈

umbilici₁₉

upclimbs₂₂

n -

unplaits₁₄

unstably₁₆

r -

tumbrils₁₆

ultraism₁₃

v -

visually₁₇

vitalism₁₆

w -

twibills₁₆

waybills₁₈