When a word’s vocalization imitates a natural sound, as can be heard in the words murmur, buzz, and pop, what do we call that device?

The device where a word’s vocalization imitates a natural sound, as can be heard in the words murmur, buzz, and pop, is called "Onomatopoeia".

Here are the steps to understand this:

1. First, understand the question: It's asking for a term that describes a word that sounds like the noise it is referring to.

2. Recall the term: The term for this is "Onomatopoeia".

3. Onomatopoeia is a figure of speech where words are used that mimic the sounds they describe.

4. Examples of onomatopoeia include words like "buzz", "pop", "murmur", "bang", "beep", and "click". These words sound like the noises they represent.