prognosticate vs portend

prognosticate and portend both are verbs.

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

As verbs, prognosticate and portend are synonyms defined as:

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

prognosticate (verb)	portend (verb)
make a prediction about; tell in advance	indicate, as with a sign or an omen
indicate, as with a sign or an omen