What are the best answers for “(of words) formed in imitation of a natural sound”?

echoic, onomatopoeic, onomatopoetic.

How many letters does the top answer for “(of words) formed in imitation of a natural sound” have?

The most common answer is echoic (6 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

echoic 6 letters wn-def

(of words) formed in imitation of a natural sound

onomatopoeic 12 letters wn-def

(of words) formed in imitation of a natural sound

onomatopoetic 13 letters wn-def

(of words) formed in imitation of a natural sound