augur vs omen

augur and omen both are nouns.

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

As verbs, augur and omen are synonyms defined as:

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

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