The best replacement for omen is maller.

The best alternatives to omen are rated as following:
★★★★★  maller
★★★  exorcist
★★  arbitrator
★★  xl1
★★  skada
★★  cf5
★★  omen
★  thorax
★  harbinger
★  cf4
★  lore
★  mathews monster
★  ktm
★  portent
★  bonkers
★  klh
★  frozen heart
  demarini cf5
  tekton lore
  mr5
  xlr8
  soul reaver
  demarini voodoo
  dream season
  oman

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Speaking about omen, one probably shouldn't forget about bird flying into a window.

Other search terms related to omen and their ratings are:
★★★★★ bird flying into a window
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Google Trends

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omen
maller
exorcist