tough, though, through, thorough, thought

tough /tʌf/ - sounds like enouɡh
The exam was tough!

though /ðəʊ/
Even though she wanted to talk about it, she didn't tell anyone the secret.

through /θruː/
Just walk through that door and you'll see it on the right.

thorough /ˈθʌrə/ - sounds like borouɡh
Well done for doing such a thorough job!

thought /θɔːt/ - sounds like bouɡht
I thought it was tomorrow!