shudder vs quiver

shudder and quiver both are nouns.

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

As nouns, quiver is a hypernym of shudder; that is, quiver is a word with a broader meaning than shudder:

Other hypernyms of shudder include quivering, vibration.

As nouns, shudder and quiver are synonyms defined as:

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

shudder (noun)	quiver (noun)
an involuntary vibration (as if from illness or fear)	the act of vibrating
an almost pleasurable sensation of fright	case for holding arrows
	an almost pleasurable sensation of fright
	a shaky motion

shudder (verb)	quiver (verb)
shake, as from cold	shake with fast, tremulous movements
tremble convulsively, as from fear or excitement	move with or as if with a regular alternating motion
	move back and forth very rapidly