Onomatopoeia is a literary device in which a word is named after the sound it is trying to describe. Splash, sizzle, and meow are all examples of onomatopoeia. So, let's look at the poem in question. Examples of onomatopoeia in this poem can include "sputter," "mutter," "snap," and "hummed." Hope this helps.
We will dearly miss you. You have not only made this school great, but you have also made us, the students, great. We thank you for all your hard work and dedication that you put into this school. We wish you farewell and hope you enjoy your retirement.