ill-omened vs ill-fated

ill-omened and ill-fated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ill-omened	No	Yes	No	No
ill-fated	No	Yes	No	No

As adjectives, ill-omened and ill-fated are synonyms defined as:

Other synonyms of ill-omened include doomed, ill-starred, unlucky.

ill-omened (adjective)	ill-fated (adjective)
marked by or promising bad fortune	marked by or promising bad fortune