portent vs prodigy

portent and prodigy both are nouns.

Word	Noun	Adjective	Verb	Adverb
portent	Yes	No	No	No
prodigy	Yes	No	No	No

As nouns, portent and prodigy are synonyms defined as:

Other synonyms of portent include omen, presage, prognostic, prognostication.

portent (noun)	prodigy (noun)
a sign of something about to happen	an impressive or wonderful example of a particular quality
	a sign of something about to happen
	an unusually gifted or intelligent (young) person; someone whose talents excite wonder and admiration