[petersumskas]

Australia is about the same except around the ceiling we call it a cornice.

[TheSpiceIsLife]

Slight correction: Around windows its architraves and reveals.

But I’m in Tasmania, some geographic variation in dialect can be expected.

Except, I’m from South Australia, so some people around here think I talk posh.

[ChoGGi]

For me the reveal is the amount of space between the window casing/trim and the frame of the window.

[secondcoming]

Cornice is used in the UK too, I've never heard of coving.

[walthamstow]

Interesting, maybe it's a regional thing - I'm from London.

The category on the B&Q site is called "cornice & coving" so either they mean the same thing or there's a subtle difference in which one is which. Maybe one is plaster and one is wood?

[ChoGGi]

Same, I've heard it rarely used. Never heard coving before.