shudder vs fright

shudder and fright both are nouns.

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

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

shudder: an almost pleasurable sensation of fright
fright: an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)

Other hypernyms of shudder include fear, fearfulness.

shudder (noun)	fright (noun)
an involuntary vibration (as if from illness or fear)	an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)
an almost pleasurable sensation of fright

shudder (verb)	fright (verb)
shake, as from cold	cause fear in
tremble convulsively, as from fear or excitement