portend vs foreshadow

portend and foreshadow both are verbs.

Word	Noun	Adjective	Verb	Adverb
portend	No	No	Yes	No
foreshadow	No	No	Yes	No

As verbs, portend and foreshadow are synonyms defined as:

Other synonyms of portend include augur, auspicate, betoken, bode, forecast, foretell, omen, predict, prefigure, presage, prognosticate.

portend (verb)	foreshadow (verb)
indicate, as with a sign or an omen	indicate, as with a sign or an omen