Syntax region problem

Hi,

I would like to highlight only the word of gravity level 'Debug' in this sentence :

2016-04-18 16:57:43.207000 Debug SomeInformations


I have tried this but it highlight more than the word :


syn match Debug '\<Debug\>'
syntax region Debug matchgroup=Debug start="\d\s" end="\s" contains=@Debug
hi link Debug airline_warning



I don't want start and end will be inside highlighting, can you help me ?
Thank you



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