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 spelling of skillful is skillful in a British accent
Yes, the spelling of the word 'recognize' is American English. In British English, it is spelled as 'recognise'.
The British English spelling of marvelous (astonishing; wonderful) is marvellous.
The correct spelling is "modernize" in American English or "modernise" in British English.
centimetre (British spelling), centimeter (U.S. spelling)
You can use a program like myWriterTools to automatically change British spelling and word usage to American spelling and usage, or vice-versa.
No, the word blazing has two syllables. Blaz-ing.
The word "specialise" is the British English spelling of "specialize" (US spelling).
Spelt with an 's' not a 'z' as in revitalisation
Spelt with an 's' not a 'z' as in revitalisation
'Amazing' is the correct spelling in Britain.
Fueled (with one L) is the American spelling. Fuelled (with two L's) is the British spelling.