Curiosity--if I did rename ORLY and YARLY into just ORLY, would I later on be able to upload a new YARLY? If so, what would happen to really old posts that initially used that icon, display ORLY or YARLY?
Renaming does a full brute-force overwrite of the old keyword associations. So if you rename YARLY to ORLY, it would make it as if you'd never posted anything using the YARLY keyword. So you could afterwards put the YARLY keyword on a new icon, and any new posts you made with that keyword would use the new icon. But the old posts would act as if they'd always been posted with ORLY.
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Renaming does a full brute-force overwrite of the old keyword associations. So if you rename YARLY to ORLY, it would make it as if you'd never posted anything using the YARLY keyword. So you could afterwards put the YARLY keyword on a new icon, and any new posts you made with that keyword would use the new icon. But the old posts would act as if they'd always been posted with ORLY.