onomatopoeic vs echoic

onomatopoeic and echoic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
onomatopoeic	No	Yes	No	No
echoic	No	Yes	No	No

As adjectives, onomatopoeic and echoic are synonyms defined as:

onomatopoeic and echoic: (of words) formed in imitation of a natural sound

Other synonyms of onomatopoeic include imitative, onomatopoeical, onomatopoetic.

onomatopoeic (adjective)	echoic (adjective)
(of words) formed in imitation of a natural sound	(of words) formed in imitation of a natural sound
of or relating to or characterized by onomatopoeia	like or characteristic of an echo