the repetition of similar vowels in successive words
The splendid onomatopoeia of "hoary roaring sea" reminds us how well assonance and alliteration work throughout the poem.
The Guardian
(Jun 25, 2012)
While assonance is the repetition of vowel sounds, alliteration is the repetition of the same consonant sound at the beginnings of words or in stressed syllables.
a harmonious state of things and of their properties
There is a consonance of all things, a blending of all that we know about the material world and the spiritual.
Keller, Helen
Consonance can be an antonym of dissonance, as in the example sentence, but it also has a technical meaning that's connected assonance and alliteration: the repetition of similar consonant sounds, especially at the ends of words.
All the overtones of the one sound now fall alongside those of the other; beats are at once produced; the combination of the tones becomes unpleasant: we obtain a dissonance.
Mach, Ernst
Instead, he lets his ears guide him on an adventure to track down quirky, extreme and historically venerated phenomena of our sonic universe.
New York Times
(Apr 23, 2014)
image produced by reflections of high-frequency sound waves
I find prenatal vitamin recommendations, sonograms, and photocopies of each visit to the doctor.
Everything, Everything
sonare + gram (suffix forming nouns about instruments for recording or something written)
Compare with ultrasound, below. A sonogram is an image produced by ultrasound technology, both although both words are now used interchangeably by excited prospective parents.