credo vs philosophical system

credo and philosophical system both are nouns.

Word	Noun	Adjective	Verb	Adverb
credo	Yes	No	No	No
philosophical system	Yes	No	No	No

As nouns, philosophical system is a hypernym of credo; that is, philosophical system is a word with a broader meaning than credo:

credo: any system of principles or beliefs
philosophical system: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of credo include doctrine, ism, philosophy, school of thought.

credo (noun)	philosophical system (noun)
any system of principles or beliefs	a belief (or system of beliefs) accepted as authoritative by some group or school