#sound symbolism

Ideophones

Ideophones are a word class (part of speech) that occur independently in some languages, mostly in Africa and in Asia. They can be quite extensive, like nouns and verbs, or they can be a small class.
Ideophones are words which exhibit sound symbolism, are iconic, can involve onomatopoeias, and are frequently used in narrations, frequentely reduplicated, and show moods, states, forms, colours, movements, etc. They differ from interjection by the sound symbolism and non-isolate distribution (unlike interjections, which can stand alone like “ouch”).

Japanese is a good example:
doki doki (ドキドキ) — heartbeat: excitement
kira kira (キラキラ) — glitter
shiin (シーン) — silence
niko niko (ニコニコ) — smile
Jiii (じ-) — stare

https://en.wikipedia.org/wiki/Ideophone

If you know more languages that use ideophones, please let me know, because there’s relatively few literature about this. Be aware that not all onomatopoeias are ideophones, though.