O(nomatopoeia)

onomatopoeia noun
on·​o·​mato·​poe·​ia | \ ˌä-nə-ˌmä-tə-ˈpē-ə , -ˌma-\
Definition of onomatopoeia
1 : the naming of a thing or action by a vocal imitation of the sound associated with it (such as buzz, hiss)
also : a word formed by onomatopoeia
In comic books, when you see someone with a gun, you know it's only going off when you read the onomatopoeias.
— Christian Marclay
2 : the use of words whose sound suggests the sense
a study of the poet's onomatopoeia