omen vs augur

omen and augur both are nouns.

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

As verbs, omen and augur are synonyms defined as:

omen (noun)	augur (noun)
a sign of something about to happen	(ancient Rome) a religious official who interpreted omens to guide public policy

omen (verb)	augur (verb)
indicate, as with a sign or an omen	indicate, as with a sign or an omen
	predict from an omen