A homograph is a word that is spelled the same as another word but has a different meaning and sometimes a different pronunciation. "Plow" is a relatively unique word in terms of spelling.
However, there are a few words that come close:
* "Plough" is the British English spelling of the same word, meaning the agricultural tool.
While not a true homograph, this is the closest you'll get to a word that looks exactly the same but has a slightly different meaning due to regional variation.