a word with the same spelling as another or others, but with different meaning and pronunciation (Ex.: tear, a drop of water from the eye, and tear, to rip)
back-form < heteronymous, modeled on synonym
See heteronym in American Heritage Dictionary 4
One of two or more words that have identical spellings but different meanings and pronunciations, such as row (a series of objects arranged in a line), pronounced (rō), and row (a fight), pronounced (rou).