There are many words in British and American English which sound the same and have the same meaning but are spelt differently.

British American
any more anymore
I can’t put up with the naughty boys any more/anymore.
behaviour behavior
We are trying to understand the causes of criminal behavour/behavior.
l Colour, flavour, harbour, neighbour l Color, flavor, harbor, neighbor
cheque check
Fees can be paid in cash or cheque/check.
centre center
The hotel is right in the centre/center of the town.
l theatre, metre, litre, fibre l theater, meter, liter, fiber
cosy cozy
The living room is cosy/cozy
defence defense
The national defence/defense system costs a lot of money.
l offence offense
l Practice (n), practise (v) Practice (n)(v)
moustache mustache
I have decided to grow a moustache/mustache
omelette omelet
Mum made me a cheese omelette/omelet this morning.
pyjamas pajamas
Peter changed into his pyjamas/pajamas and went to bed.
tyre tire
I had to go get new tyres/tires for my car this week.
Whisky Whiskey
This book covers the history of whisky/whiskey.
l ‘Whisky’ is used for drinks produced in Scotland, Wales and Canada.
l ‘Whiskey’ is used for drinks produced in Ireland and America.