冒, a cloth hat, is a cognate of 帽. 冒 serves as phonetic component to form characters. Characters formed by the phonetic component 冒 have the same pronunciation mào.
In modern Chinese, 冒 means：risk, brave, dare, emit, give off
Characters formed by the phonetic component 冒
帽 瑁 媢 冐 毷 蝐 萺 have the same pronunciation mào.