1、两词同义并可换用，但although语气较重，通常放在句首并用于正式场合。如：
I'd quite like to go out,(al)though it is a bit late.我很想外出，虽然为时稍晚。
Although it was snowing,it was not very cold.虽然下着雪，但并不很冷。
2、用though时，可将强调的词前置，但although不能。as也有此种倒装结构。如：
Poor though/as he is,he is happy.虽然他穷，但过得很愉快。
Child though/as she was,the actress was drawing a crowd.尽管还是个孩子，这个女演员却引起了人们的注目。（child前无冠词a）
3、although引导从句常指事实，而though引导的句子可表假设。如：
Let's start as arranged though it rains tomorrow.即使明天下雨，咱们也按预定的计划出发吧。（假设）
He was not unhappy although he had to live alone.虽然得一个人生活，他毫无不快之感。（事实）
4、although只用作连词，而though除作连词外，还可用作副词，常置句末，句子较长时，也置于句中。如：
It's hard work,I enjoy it though.这是苦差事，可我干得颇有乐趣。
There's no excuse,though,for hurting her feelings.伤到她的感情一事，还是不可原谅。
5、though可用于even though,as though等结构，although则不能。如：
Even though I fail,I'll keep on trying.我纵然失败，仍会继续尝试下去。
You look as though(=as if)you know each other.看起来你们好像彼此认识。
6、although和though用作连词时不能和but连用，但可跟yet,still等连用。如：
Although he lives alone,yet he is happy.=He lives alone,but he is happy.他虽然单独生活，但很愉快。
7、though常用于省略句。如：Though(he is)alone,he is happy.