区别就是两者意思是不一样，具体的不同如下

bowknot中文意思是n，蝴蝶结

She loved to have baths， wearing clothes， and wearing a bow on her left ear， even though a bowknot doesn't look pretty on pigs.

bow中文意思是v. 鞠躬，点头低下（头）停止对抗，屈从于（使）弯曲用弓拉奏（乐曲）<美>（新影片）首映，（新产品）投放市场