homonym (n.)

"word pronounced and perhaps spelled the same as another but different in meaning," 1807, from French homonyme and directly from Latin homonymum (Quintilian), from Greek homonymon, neuter of homonymos, from homos "same" (see homo- (1)) + onyma, dialectal form of onoma "name" (from PIE root *no-men- "name"). Related: Homonymic.