augur vs prognosticate

augur is a noun but prognosticate is not a noun.

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

As verbs, augur and prognosticate are synonyms defined as:

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

As verbs, prognosticate is a hypernym of augur; that is, prognosticate is a word with a broader meaning than augur:

Other hypernyms of augur include anticipate, call, forebode, foretell, predict, promise.

augur (noun)	prognosticate (noun)
(ancient Rome) a religious official who interpreted omens to guide public policy

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