Generally, although is used in more formal writing, though not always. (See what I did there?) Though is more often used in speech and casual writing. Additionally, although usually begins a sentence, while though can come at the beginning of any clause.

Can though be used as although?

Though for Informal Spoken English

In general, though is used more frequently than although especially in spoken English. They convey the same meaning but although is thought of as a more formal choice.

What is the difference in use even though though and although?

Even though has the same meaning as although. It also indicates contrast. Therefore, it is also used after a clause, just like although. The only difference between although and even though is that even though often indicates a stronger and a more emphatic contrast.