The Collaborative International Dictionary
                    Masquerader
                    
                        
                
                                                                    Masquerader \Mas`quer*ad"er\, n. One who masquerades; a person wearing a mask; one disguised.
Wiktionary
                    masquerader
                    
                        
                
                                                                    n. One who masquerades; a person wearing a mask; one disguised.
WordNet
Usage examples of "masquerader".
From such a lookout spot, Case Brandle, the masquerader, made a perfect replica of The Shadow.
In staggery fashion, the masquerader reached for a gun and snatched it from the floor.
Tonight the celebrating culminated in a frenzy of singing, lively dancing and masqueraders who roamed the brilliant streets.