There seems to be two different ways to spell "expediter":
A quick Google search reveals a nearly equal split between the two spellings. Are the two spellings specific to a particular region or culture? Is there some subtle difference in meaning that I am not aware of?
Why do we have two different spellings?
Best Answer
expediter
On the other hand,
expeditor
We can see the usage difference from the WP article on Expediting.
The -er suffix is used for the generic noun derivative of 'performer of the action' of expedite as usual: expediter:
The -or suffix is used for the specific office/designation assigned with the duties of expediting in the specific business context: