writhe vs squirm

writhe is not a noun while squirm is a noun.

Word	Noun	Adjective	Verb	Adverb
writhe	No	No	Yes	No
squirm	Yes	No	Yes	No

As verbs, writhe and squirm are synonyms defined as:

writhe and squirm: to move in a twisting or contorted motion, (especially when struggling)

Other synonyms of writhe include twist, worm, wrestle, wriggle.

writhe (noun)	squirm (noun)
	the act of wiggling

writhe (verb)	squirm (verb)
to move in a twisting or contorted motion, (especially when struggling)	to move in a twisting or contorted motion, (especially when struggling)