Many of these are differences between British & US spelling (for convenience, I've used "British" to refer to non-US usage. Most of the Commonwealth countries, including Australia, lean towards the British usage). However, despite what some websites will have you believe, this is not the only reason for variant spellings.

I've tried to keep this page simple. Its original purpose was to be a place for a quick check before 'correcting' supposed misspellings. However, sometimes clarification is needed or I came across something interesting while investigating a pair. In these cases, I've added a link to a separate page . At the bottom of that page there are also links to other web sites which go into more detail than I care to.

re vs er

our vs or

ise vs ize

e on the end

ll vs l

ce vs se

Others

Other spelling variations
Not necessarily US vs other.

t vs ed

-tion vs -xion

More than one variant (some of which are obsolete)

in vs en

Miscellaneous: either unclassified or awaiting further research