quivering vs shudder

quivering and shudder both are nouns.

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

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

Other hyponyms of quivering include tremor.

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

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