ism vs doctrine

ism and doctrine both are nouns.

Word	Noun	Adjective	Verb	Adverb
ism	Yes	No	No	No
doctrine	Yes	No	No	No

As nouns, ism and doctrine are synonyms defined as:

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

Other synonyms of ism include philosophical system, philosophy, school of thought.

ism (noun)	doctrine (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