prognosticate vs augur

prognosticate is not a noun while augur is a noun.

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

As verbs, augur is a hyponym of prognosticate; that is, augur is a word with a more specific, narrower meaning than prognosticate:

Other hyponyms of prognosticate include read, outguess, second-guess, bet, wager, calculate, forecast, prophesy, vaticinate.

As verbs, prognosticate and augur are synonyms defined as:

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

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

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