onomatopoeical vs onomatopoeic

onomatopoeical and onomatopoeic both are adjectives.

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

As adjectives, onomatopoeical and onomatopoeic are synonyms defined as:

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

Other synonyms of onomatopoeical include echoic, imitative, onomatopoetic.

onomatopoeical (adjective)	onomatopoeic (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