*homophonous*

{ } a. [ Gr. &unr_;; &unr_; the same + &unr_; sound, tone: cf. F. homophone. ] 1. (Mus.) (a) Originally, sounding alike; of the same pitch; unisonous; monodic. (b) Now used for plain harmony, note against note, as opposed to polyphonic harmony, in which the several parts move independently, each with its own melody. [ 1913 Webster ]

2. Expressing the same sound by a different combination of letters; as, bay and bey. [ 1913 Webster ]