credo vs creed

credo and creed both are nouns.

Word	Noun	Adjective	Verb	Adverb
credo	Yes	No	No	No
creed	Yes	No	No	No

As nouns, credo and creed are synonyms defined as:

credo (noun)	creed (noun)
any system of principles or beliefs	any system of principles or beliefs
	the written body of teachings of a religious group that are generally accepted by that group