ominous vs menacing

ominous and menacing both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ominous	No	Yes	No	No
menacing	No	Yes	No	No

As adjectives, ominous and menacing are synonyms defined as:

ominous and menacing: threatening or foreshadowing evil or tragic developments

Other synonyms of ominous include baleful, forbidding, minacious, minatory, sinister, threatening.

ominous (adjective)	menacing (adjective)
threatening or foreshadowing evil or tragic developments	threatening or foreshadowing evil or tragic developments
presaging ill fortune