foretell vs augur

foretell is not a noun while augur is a noun.

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

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

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

As verbs, foretell and augur are synonyms defined as:

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

foretell (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
foreshadow or presage