This article is from the soc.culture.australian FAQ, by Stephen Wales with numerous contributions by others.
[SW] For the most part, Australian spelling appears to follow the British
mould (funny that). The letter 'u' appears in words like 'humour', 'colour',
labour et. al., unlike the corresponding American spelling of these words
(humor/color/labor).
There are other differences as well. The word 'tyre' gets 'tire' in the USA.
'Cheque' becomes 'check' in the USA.
I am by no means a linguist, but these are some examples that come to mind.
[Anyone care to add to this ? SW]
 
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