echoic vs onomatopoetic

echoic and onomatopoetic both are adjectives.

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

As adjectives, echoic and onomatopoetic are synonyms defined as:

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

Other synonyms of echoic include imitative, onomatopoeic, onomatopoeical.

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