philosophy vs philosophical system

philosophy and philosophical system both are nouns.

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

As nouns, philosophy and philosophical system are synonyms defined as:

philosophy and philosophical system: a belief (or system of beliefs) accepted as authoritative by some group or school

Other synonyms of philosophy include doctrine, ism, school of thought.

philosophy (noun)	philosophical system (noun)
the rational investigation of questions about existence and knowledge and ethics	a belief (or system of beliefs) accepted as authoritative by some group or school
a belief (or system of beliefs) accepted as authoritative by some group or school
any personal belief about how to live or how to deal with a situation