The concept of extracting wave energy using wave energy converters (WEC) and wind energy using offshore wind turbines involves high cost of installing and maintenance. To reduce the economic value of the overall project by sharing mooring systems, electrical cables and better use of ocean area, the concept of combining wind turbine with a WEC has come into existence. Using the combined concept of wave and wind energy device, not only the overall project cost reduces but also the power production increases. The present study deals with the coupled dynamic analysis of 5 MW offshore floating wind turbine combined with wave energy converter system to study the motion behaviour of combined energy concept under operational conditions using time domain aero-servo-hydro-elastic simulation along with the wave load response analysis. The responses in all 6-DoF are predicted, compared and analysed for different wind speed and wave height. The platform forces and moments are also obtained and the transfer functions for these responses are evaluated using aero-servo-hydro-elastic simulation. Further, a brief comparative study of different combined energy models are performed in details.