ass和bum有什么区别吗

都有屁股的意思，且在词性上ass和bum都可以当名词。但是bum还可以当动词和形容词。

但ass还有如下意思：

ass：驴子；? 愚蠢的人；还有驴、傻瓜；笨蛋、?屁股、（通过语言或暴力）泄愤，发泄不满情绪、（粗鲁地表示愤怒或异议）去你的，去死、出洋相;闹笑话等意思。

bum也有如下意思：

n.流浪者；?屁股；?狂欢作乐；?笨蛋，废物

例句：Someone's bum is the part of their body which they sit on.

vt.乞讨；

例句：A bum is a person who has no permanent home or job and who gets money by working occasionally or by asking people for money.

vi.流浪；?闲荡；

例句：I think they're just bumming around at the moment, not doing a lot...?

adj.质量低劣的，无价值的；?无价值的；?残废的；?很不愉快的