The British spelling of supervisor is "supervisor."
The British spelling of skillful is skillful in a British accent
The British spelling is "squash" and the American spelling is also "squash." Both countries use the same spelling for this word.
The spelling "summarise" is the correct British spelling of the word.The US spelling is summarize.
Apologized is the American spelling, and apologised is the British spelling.
The correct spelling is British Columbia. This is a province in Canada.
The spelling for supervisor is supervisor; you had it spelled correctly in the question.
That is the correct spelling of "supervisor" (manager, overseer).
The British spelling of skillful is skillful in a British accent
The British spelling is "squash" and the American spelling is also "squash." Both countries use the same spelling for this word.
The word is spelt as you have in the question. As it happens, there is no difference between the American spelling and British spelling of the words.
The British English spelling of marvelous (astonishing; wonderful) is marvellous.
British spelling: meagre
The spelling "summarise" is the correct British spelling of the word.The US spelling is summarize.
Apologized is the American spelling, and apologised is the British spelling.
Savior is the American spelling. Saviour is the British spelling.
The spelling of the adjective is British.(For the differences in US and British spelling, see the related link.)
The British spell it "skilful".