writhing vs wriggling

writhing and wriggling both are adjectives.

Word	Noun	Adjective	Verb	Adverb
writhing	No	Yes	No	No
wriggling	No	Yes	No	No

As adjectives, writhing and wriggling are synonyms defined as:

writhing and wriggling: moving in a twisting or snake-like or wormlike fashion

Other synonyms of writhing include wiggly, wriggly.

writhing (adjective)	wriggling (adjective)
moving in a twisting or snake-like or wormlike fashion	moving in a twisting or snake-like or wormlike fashion