没有什么区别，这是中英叫法的不同。
bye
英[baɪ] 美[baɪ]
int.再见;再会
n.轮空(参赛者无对手而自动进入下一轮比赛)
复数：byes
Bye Mum, see you in a minute
妈妈，一会儿见。
扩展资料：
近义词：goodbye
英[ˌɡʊdˈbaɪ] 美[ˌɡʊdˈbaɪ]
int./n.
再见;再会
复数：goodbyes
He said his goodbyes knowing that a long time would pass before he would see his child again
他道了别，知道要过很久才能再见到他的孩子。