what the hell does the word 'blackguard' mean? what is the difference ?

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Good Morning,Dear mylotters,i'm in trouble in distinguishing blackguard , scoundrel ,rogue ,rascal,ruffian,villain,hooligan etc.because they have the same meaning in chinese. i'm a little doubtful for the english-chinese dictionary.could you kind to tell them apart?especially what do they do in their everyday life,such as what is the typical behavior the blackguard usually do?many thanks