Although and though are not interchangeable words
Two commonly misused words in the English language are “although” and “though” because so many people use them interchangeably. This is because it is thought that these words have the same meaning, but that is not the case.
You can take more liberties with the use of “though” because it can be used in any part of a sentence. Here are some examples of sentences that illustrate this point:
Though he was had the engine apart to work on it, he left what he was doing to answer my questions.
He was very ill though he is feeling better now.
It was a very large gathering. It wasn’t crowded in the hall though.
You can also rewrite these sentences so that the word “though” is placed in a different part of the sentence. For example, the first sentence can be rewritten as:
He left what he was doing to answer my questions, though he had the engine apart to work on it.
The meaning of the sentence remains the same. This is the reason that “though” is called a liberal conjunction. You can use “though” in academic writing, but only if you are writing informally.
“Although” is a conjunction, but it really can only be used at the beginning or in the middle of a sentence, if it used to connect two independent clauses. To add it at the end would make the sentence grammatically incorrect. The fact that “although” is mainly used as an introductory word at the beginning of a sentence is the main difference between the two words.