I just learned Onomatopoeia is the name of a villain in Green Arrow and Batman comics. Hmpf.
Putting that aside, an onomatopoeia is a word formed from an imitation of related sounds, such as splash, thump, or blink. Wait, blinking doesn’t make any sound, but perhaps it is an onomatopoeia by another name. I don’t know Latin enough to suggest an alternative word.
This writer on Japanese language and culture applies the term to many interesting Japanese words. “A well-cleaned floor shines pika pika, while a light, fluffy futon is fuwa fuwa.” The word for “thorn” is ira and for “annoyed” is ira ira.