weathercock
weath.er.cock \-.ka:k\ n 1: a vane often in the figure of a cock mounted so as to turn freely with t he wind and show its direction 2: a person or thing that changes readily or often
Webster's English Dictionaryweath.er.cock \-.ka:k\ n 1: a vane often in the figure of a cock mounted so as to turn freely with t he wind and show its direction 2: a person or thing that changes readily or often