Manichean vs Manichaean

Manichean and Manichaean both are nouns.

Word	Noun	Adjective	Verb	Adverb
Manichean	Yes	Yes	No	No
Manichaean	Yes	Yes	No	No

As adjectives, Manichean and Manichaean are synonyms defined as:

Other synonyms of Manichean include Manichee.

As nouns, Manichean and Manichaean are synonyms defined as:

Other synonyms of Manichean include Manichee.

Manichean (noun)	Manichaean (noun)
an adherent of Manichaeism	an adherent of Manichaeism

Manichean (adjective)	Manichaean (adjective)
of or relating to Manichaeism	of or relating to Manichaeism
	of or relating to the philosophical doctrine of dualism