grimace vs wince

grimace and wince both are nouns.

Word	Noun	Adjective	Verb	Adverb
grimace	Yes	No	Yes	No
wince	Yes	No	Yes	No

As verbs, wince is a hyponym of grimace; that is, wince is a word with a more specific, narrower meaning than grimace:

Other hyponyms of grimace include squinch, squint, smile, frown, glower, lour, lower, screw up, mop, mow, pout.

grimace (noun)	wince (noun)
a contorted facial expression	a reflex response to sudden pain
	the facial expression of sudden pain

grimace (verb)	wince (verb)
contort the face to indicate a certain mental or emotional state	make a face indicating disgust or dislike
	draw back, as with fear or pain