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I know I've mentioned this before, but one of my favorite features on the Mac that has no equivalent on an iPhone or iPad is adding new words to the system-wide spelling dictionary. The feature dates back to Mac OS X 10.0 and I'm pretty sure was in NeXTStep a decade before that.

And, even better, the custom words you add to the dictionary are stored in a simple text file, one word per line, at:

~/Library/Group Containers/group.com.apple.AppleSpell/Library/Spelling/LocalDictionary