onomatopoetic vs echoic

onomatopoetic and echoic both are adjectives.

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

As adjectives, onomatopoetic and echoic are synonyms defined as:

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

Other synonyms of onomatopoetic include imitative, onomatopoeic, onomatopoeical.

onomatopoetic (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