startle vs wince

startle and wince both are nouns.

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

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

Other hyponyms of startle include startle reaction, startle response, Moro reflex, startle reflex, flinch.

startle (noun)	wince (noun)
a sudden involuntary movement	a reflex response to sudden pain
	the facial expression of sudden pain

startle (verb)	wince (verb)
to stimulate to action	make a face indicating disgust or dislike
move or jump suddenly, as if in surprise or alarm	draw back, as with fear or pain