What device is THE use of "buzz" and "hiss" as words?

The use of "buzz" and "hiss" as words falls under the category of onomatopoeia. Onomatopoeia refers to words that phonetically imitate, resemble, or suggest the sound that they describe. In this case, "buzz" mimics the sound made by bees or other similar insects, while "hiss" represents the sound that snakes or steam might produce. Both terms are effective because they create a sensory experience for the reader, allowing them to hear the sounds being described.

In contrast, simile involves a comparison using "like" or "as," which does not apply here since the words are sound descriptors rather than comparative phrases. Alliteration refers to the repetition of the same initial consonant sounds in a series of words, which is not relevant to the nature of "buzz" and "hiss." Lastly, personification attributes human qualities to non-human entities, which is not applicable to sound words as mentioned in the question. Hence, onomatopoeia is the most fitting description for the use of "buzz" and "hiss."