Scot, Scottish, Scotch
Scot, Scotsman, Scotswoman: preferred nouns—not Scotchman, Scotchwoman.
Scottish: preferred adjective, but Scotch as in Scotch whisky, Scotch plaid, Scotch-Irish (acceptable in U.S. context).
Scot, Scotsman, Scotswoman: preferred nouns—not Scotchman, Scotchwoman.
Scottish: preferred adjective, but Scotch as in Scotch whisky, Scotch plaid, Scotch-Irish (acceptable in U.S. context).