onomatopoetic vs onomatopoeical

onomatopoetic and onomatopoeical both are adjectives.

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

As adjectives, onomatopoetic and onomatopoeical are synonyms defined as:

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

Other synonyms of onomatopoetic include echoic, imitative, onomatopoeic.

onomatopoetic (adjective)	onomatopoeical (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