pompom
/ˈpɒmpɒm/(亦作pompon)
noun
1- a small woollen ball attached to a garment, especially a hat, for decoration（衣帽装饰用的）绒球, 丝球。
1.1
- a dahlia, chrysanthemum, or aster with small tightly clustered petals绒球花（如大丽花、菊花、紫苑等）。
词源
mid 18th cent.: French pompon, of unknown origin.