bicornuous vs bicorn

bicornuous is not a noun while bicorn is a noun.

Word	Noun	Adjective	Verb	Adverb
bicornuous	No	Yes	No	No
bicorn	Yes	Yes	No	No

As adjectives, bicornuous and bicorn are synonyms defined as:

Other synonyms of bicornuous include bicornate, bicorned, bicornuate.

bicornuous (noun)	bicorn (noun)
	a cocked hat with the brim turned up to form two points

bicornuous (adjective)	bicorn (adjective)
having two horns or horn-shaped parts	having two horns or horn-shaped parts