I'm looking for a word that categorizes rhyme, alliteration, assonance, etc. that relate to the way the word is sounded into one group/word. I hear that it could be called "sound devices" because they are utilized for their sound aspect in poetry, but it seems there may be a more technical linguistic term maybe.
Perhaps prosody is what you're looking for.
1 the science or study of poetic meters and versification.
2 a particular or distinctive system of metrics and versification: Milton's prosody.
3 Linguistics. the stress and intonation patterns of an utterance.
At its most basic, a poetic device is a deliberate use of words, phrases, sounds, and even shapes to convey meaning. That sounds so broad that it could basically encompass any form of written expression, but poetic devices are generally used to heighten the literal meaning of words by considering sound, form, and function.
The 20 Poetic Devices You Must Know by Melissa Brinks