The best replacement for announcement is pronouncement.

The best alternatives to announcement are rated as following:
★★★★★  pronouncement
★★★★  invitation
★★★  thesis statement
★★★  notification
★★  warning
★★  notice
★★  invitation wedding
★  sticky
★  advertisement
★  save the date
★  launch of new website
  job description
  wedding invitation
  invitations

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Speaking about announcement, one probably shouldn't forget about r kelly.

Other search terms related to announcement and their ratings are:
★★★★★ r kelly
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Google Trends

Scale is based on the average worldwide traffic of announcement in all years. Click on graph for more.
announcement
pronouncement
invitation