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Buoy - the name for a floating navigation mark for ships, or object at which they may moor - is pronounced in Britain as if it were the same as 'boy' - IPA: /bɔɪ/. This is also true of the abstract noun derived from it - buoyancy, the ability to float IPA: /ˈbɔɪ əns ɪ/. The pronunciation current in the US has two syllables - 'BOO-y' IPA: /ˈbuː ɪ/.