Cabin crew, cabin staff
Never air hostess
cabinet, shadow cabinet
...when referring to government. However Cabinet Office should be capitalized.
Doesn’t need an accent.
Canary Wharf
Refers to the whole development in the Docklands, not just the main tower, which is 1 Canada Square.
Canon vs cannon
Canon means cleric, decree, principle, body of writings, type of music. Cannon is something you fire.
Job titles (web designer, head of technology) should always be lower case, but personal titles (Duke of Edinburgh) should be capitalized. Place names, people’s names and any other proper noun must be capitalized.
Is the correct spelling.
Cardiac arrest
Is what happens when a heart stops beating, as opposed to a heart attack, which is when the blood flow to the heart is blocked.