Homophonous

Definition:

(a.) Originally, sounding alike; of the same pitch; unisonous; monodic.
(a.) 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.
(a.) Expressing the same sound by a different combination of letters; as, bay and bey.

Compare homophonous with other words:

homophonic vs. homophonous