Though, tough, through, thought, thorough
though /ðəʊ/ — in spite of, despite the fact that, although
tough /tʌf/ — hard, difficult, severe
through /θruː/ — from one side to the other; with the help of, by means of
thought /θɔːt/ — idea; past forms of the verb "to think"
thorough /ˈθʌrə/ — careful, detailed, in-depth