dualism vs philosophical system

dualism and philosophical system both are nouns.

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

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

dualism: the doctrine that reality consists of two basic opposing elements, often taken to be mind and matter (or mind and body), or good and evil
philosophical system: a belief (or system of beliefs) accepted as authoritative by some group or school

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

dualism (noun)	philosophical system (noun)
the doctrine that reality consists of two basic opposing elements, often taken to be mind and matter (or mind and body), or good and evil	a belief (or system of beliefs) accepted as authoritative by some group or school