Nicene Creed vs creed

Nicene Creed and creed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nicene Creed	Yes	No	No	No
creed	Yes	No	No	No

As nouns, creed is a hypernym of Nicene Creed; that is, creed is a word with a broader meaning than Nicene Creed:

Nicene Creed: (Christianity) a formal creed summarizing Christian beliefs; first adopted in 325 and later expanded
creed: the written body of teachings of a religious group that are generally accepted by that group

Other hypernyms of Nicene Creed include church doctrine, gospel, religious doctrine.

Nicene Creed (noun)	creed (noun)
(Christianity) a formal creed summarizing Christian beliefs; first adopted in 325 and later expanded	any system of principles or beliefs
	the written body of teachings of a religious group that are generally accepted by that group