ASS'ONANCE, in poetry, a term used when the terminating words of lines have the same vowel sound but make no proper rhyme.
"The New Gresham Encyclopedia. Vol. 1 Part 2" by Various
It differs from a rhyme in having the parts preceding the vowel alike.
"The English Language" by Robert Gordon Latham
But if they end in a Consonant or mute E, the Rhyme must begin at the Vowel that precedes that Consonant, and continue to the end of the Word.
"The Art of English Poetry (1708)" by Edward Bysshe