Sceptic vs. skeptic
skeptic in North America; sceptic everywhere else.
skeptic in North America; sceptic everywhere else.
labor in the U.S.; labour everywhere else.
They are generally used interchangeably in the U.S., while usage varies elsewhere.
In the U.S., license is both a noun and a verb. Outside the U.S., the noun is spelled licence.
Somber in the U.S.; sombre everywhere else.
Learned is more common everywhere, especially in the U.S. Learnt is especially common in British English.
percent in the U.S.; per cent everywhere else.