Assonance

In wordplay, assonance is when a phrase or sentence has the similarity of two or more vowel sounds or the repetition of two or more consonant sounds, especially in words that are close together in a poem.
Here is an example of consonant repetition, with the repeated sound in bold lettering:
"Try to trick the trick-or-treaters, Trey."
Here is an example of vowel repetition, with the repeated sound in bold lettering:
"How can I plow right now?"