Vowel rhyme is so indefinite as at times to seem accidental, and there are conflicting definitions of just what it is. One definition would be to call it assonance that occurs at the end of lines of poetry, in the place of the usual rhymes ("assonance" being the more general term for the recurrence of identical or closely similar vowel sounds).

In the example below, Seamus Heaney uses assonantal or vowel rhyme--this example also being feminine:

His voice eddying with the vowels of all rivers
came back to me, though he did not speak yet,
a voice like a prosecutor's or singer's

We know that this is not accidental because Heaney has set up a terza rima pattern and means these two words to act as rhymes, though all that connects them is the short "i" followed by the "ers."
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