shudder vs shiver

shudder and shiver both are nouns.

Word	Noun	Adjective	Verb	Adverb
shudder	Yes	No	Yes	No
shiver	Yes	No	Yes	No

As nouns, shudder and shiver are synonyms defined as:

Other synonyms of shudder include chill, frisson, quiver, thrill, tingle.

As verbs, shudder and shiver are synonyms defined as:

As verbs, shudder and shiver are synonyms defined as:

Other synonyms of shudder include thrill, throb.

shudder (noun)	shiver (noun)
an involuntary vibration (as if from illness or fear)	a reflex motion caused by cold or fear or excitement
an almost pleasurable sensation of fright	an almost pleasurable sensation of fright

shudder (verb)	shiver (verb)
shake, as from cold	shake, as from cold
tremble convulsively, as from fear or excitement	tremble convulsively, as from fear or excitement