1. 圆石头：bowl 碗 | bowlder 圆石头 | bowleg O形腿
2. 玉石：bowlcup 瓯 | bowlder 玉石 | bowlegsvarus 弓形腿
3. 圆石头/玉石：bowknot /蝴蝶结/ | bowlder /圆石头/玉石/ | bowlegged /弯脚的/
noun
1. bowlder的反义词
1. a large smooth mass of rock detached from its place of origin
Synonym: boulder