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I don't know if there's a word for what you're talking about. However, there is a thread on reddit where users made a list of words like this: https://www.reddit.com/r/linguistics/comments/1cmpyo/tiliterateandreiteratemeanthesame_thing/

A related term is auto-autonym, or contranym, where a word can mean two different and opposite things: for example, cleave can mean to cling or to separate. Here's a Wikipedia article: https://en.wikipedia.org/wiki/Auto-antonym