Other forms: consonances
The noun consonance refers to a state of agreement or harmony of parts, and it often refers to a pleasing combination of musical sounds.
In its musical sense, the opposite of consonance is dissonance. Consonance can also refer to a repetition of consonants in words that are close together, as the "ck" in "thick sock." In this sense, the opposite is assonance, which is a repetition of vowel sounds, as the "a's" in "bake sale."