Typonym

[Sommer]

[Analogous] to synonym, typonyms are words that sound and mean the same but are spelled [differently] due to [typographical error].

[Luis Fok]

A word that would be the same as another word if spelled without [typographical error]. This word is becoming increasingly relevant with the widespread usage of instant messaging services and [rushed] emails. When reading messages written in a hurry, one is alert for all words as well as their typographical [counterparts].