Muhammadanism vs Mohammedanism

Muhammadanism and Mohammedanism both are nouns.

Word	Noun	Adjective	Verb	Adverb
Muhammadanism	Yes	No	No	No
Mohammedanism	Yes	No	No	No

As nouns, Muhammadanism and Mohammedanism are synonyms defined as:

Muhammadanism and Mohammedanism: the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran

Other synonyms of Muhammadanism include Islam, Islamism, Muslimism.

Muhammadanism (noun)	Mohammedanism (noun)
the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran	the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran