(Al)though?

Although and though meaning ‘in spite of’

Although and though meaning ‘but’

Although can sound more formal than but. Though is much more common in speaking than in writing. Although is much more common in writing than in speaking. 

Though meaning ‘however’

This is what will be explained if you go on this link https://dictionary.cambridge.org/us/grammar/british-grammar/although-or-though

 

It can also be used like "even if" and "even though", though there might be a nuance in usage: "even though" is stronger. 

Even though, even if

Even though and even if are also used as subordinating conjunctions in the same way as although/though. Even though is similar to although but it makes a stronger contrast:

Even though I cycle to work, I don’t feel very fit.

Even if means ‘whether or not’:

Even if you run, you’ll still be late. (You’ll be late whether you run or not.)

I feel tired even if I go to bed early. (I feel tired whether I go to bed early or not.)

More on these types of conjunctions here, from where the above was taken. 

And of course, google (or better yet, ecosia) is your friend.