Englishfor English speakers
Scottish
—
noun
the dialect of English used in Scotland
—
adjective
(= Scots, Scotch)
of or relating to or characteristic of Scotland or its people or culture or its English dialect or Gaelic language
Scots Gaelic
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'
clan
—
noun
(= kin)
group of people related by blood or marriage