The best replacement for rumor is rumour.

The best alternatives to rumor are rated as following:
★★★★★  rumour
★★★★  gossip
★★★  rant
★★  rumor 2
★★  samsung rant
★  env
★  lg rumor 2
★  rumor
★  scoop
  ribas
  banter
  gravity
  trek lush
  lg scoop

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Other search terms related to rumor and their ratings are:
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Google Trends

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rumour
gossip