**Neither a teacher nor a native speaker.**
Sorry, can't help you.
Though = But, however
It's a good idea but I don't think it works.
It's a good idea, however, I don't think it works.
Although has a different meaning.
Although it's a bad idea, I think it works.
It actually worked although I was sure it wouldn't work.
I hope I could help you a bit.
Ah and yes, even though seems to be similar to although.
- For Teachers