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though1 S1 W1
1 used to introduce a statement that makes the main statement coming after it seem surprising, unlikely, or unexpected [= although]: 
Though she's almost 40, she still plans to compete.
Though she's almost 40, she still plans to compete.2 used like 'but' to add a fact or opinion that makes what you have just said seem less definite, less important etc : I thought he'd been drinking, though I wasn't completely sure. The offenders were dealt with firmly though fairly.
I thought he'd been drinking, though I wasn't completely sure.The offenders were dealt with firmly though fairly.3
as though
a) in a way that makes you think something is true [= as if]: It looks as though everyone else has gone home.
It looks as though everyone else has gone home.b) in a way that might make you think something was true, although you know it is not true [= as if]: She stared at me as though I were a complete stranger.
She stared at me as though I were a complete stranger.