"scots" in the noun sense
1. Scot, Scotsman, Scotchman
a native or inhabitant of Scotland
"scots" in the adjective sense
1. Scots, Scottish, Scotch
of or relating to or characteristic of Scotland or its people or culture or its English dialect or Gaelic language
"the Scots community in New York"
"`Scottish' tends to be the more formal term as in `The Scottish Symphony' or `Scottish authors' or `Scottish mountains'"
"`Scotch' is in disfavor with Scottish people and is used primarily outside Scotland except in such frozen phrases as `Scotch broth' or `Scotch whiskey' or `Scotch plaid'"
Source: WordNet® (An amazing lexical database of English)
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