| Word | Definitions | Synonyms |
|---|---|---|
| anechoic | (adjective) not having or producing echoes; sound-absorbent | - |
| echoic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: imitative, onomatopoeic, onomatopoeical, onomatopoetic |
| (adjective) like or characteristic of an echo | Synonyms: echolike | |
| nonechoic | (adjective) not echoic or imitative of sound | - |