The Collaborative International Dictionary
Assonate
Assonate \As"so*nate\, v. i. [L. assonare, assonatum, to respond to.] To correspond in sound.
Wiktionary
assonate
vb. to correspond in (particularly vowel) sounds.
WordNet
assonate
v. correspond in vowel sounds; rhyme in assonance; "The accented vowels assonated in this poem"