These two words, although and though, are often used as interchangeable ones. That use cannot be considered right as there is a clear difference between them.
The word though is a powerful one in the sense that it can be used at the beginning, middle or at the end of a sentence. On the other hand, the word although cannot be called a liberal conjunction since it can be used only in the beginning of a word to be suited.
It is important to note that the word though is used in an informal sense during academic writing. The usage of the liberal conjunction though can be observed carefully in the following sentences.
Though he was busy, he could allot some time to go to the hospital.
He was very sad though he recovered later.
There was no crowd. It was a huge event though.
How to use ‘although’ ?
As mentioned before although can be used only in the beginning of a word to be suited. Occasionally, it can be placed at the end of the main clause in a long sentence. Usually, it is placed at the start of a sentence. In fact, it is used as an introductory word at the beginning of a sentence. This is one of the main differences between the two words although and though.
Unlike though, although is used at the beginning of a sentence as in the following sentence.
Although she was late, she was given permission to participate in the event.