different between whackier vs whacker

English

whackier

whack +? -er

whacker (plural whackers)

One who, or something which, whacks.
(informal) Synonym of whopper (“anything large”)
(informal) Synonym of whopper (“an outrageous or blatant lie”)
- 1908, Morley Roberts, "The Captain of the Ullswater", in The Blue Peter
  But all the while Captain Amos Brown was telling whackers that would have done credit to Baron Munchausen, he was really thinking of how he was to save those whose passage to a port not named in any bills of lading looked almost certain.

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