ism vs philosophical system

ism and philosophical system both are nouns.

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

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

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

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

ism (noun)	philosophical system (noun)
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