ill-omened vs unlucky

ill-omened and unlucky both are adjectives.

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

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

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

ill-omened (adjective)	unlucky (adjective)
marked by or promising bad fortune	having or bringing misfortune
	marked by or promising bad fortune