bobble

n small woolly ball used as a decoration (esp on a hat) （装饰用的）绒线球（尤指帽子上的）.

boardwalk, boast, boast of, boaster, boastful, boastfully, boat, boat people, boat race, boat-hook, boat-house, boat-train, boater, boathook, boathouse, boatman, boatswain (also bo'sn, bos'n, bo'sun), bob, bob-sleigh, bobbin, bobby, bobby pin, bobtail, bod, bode, bodice, bodily, boding, bodkin, body, body clock, body language, body odour, body stocking, body-blow, body-building, body-snatcher, bodyguard, bodyline, bodywork,