Nouns

(n)wincethe facial expression of sudden pain
(n)wince, flincha reflex response to sudden pain

Verbs

(v)flinch, squinch, funk, cringe, shrink, wince, recoil, quaildraw back, as with fear or pain“she flinched when they showed the slaughtering of the calf”
(v)wincemake a face indicating disgust or dislike“She winced when she heard his pompous speech”