religious doctrine vs ism

religious doctrine and ism both are nouns.

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

As nouns, ism is a hypernym of religious doctrine; that is, ism is a word with a broader meaning than religious doctrine:

religious doctrine: the written body of teachings of a religious group that are generally accepted by that group
ism: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of religious doctrine include doctrine, philosophical system, philosophy, school of thought.

religious doctrine (noun)	ism (noun)
the written body of teachings of a religious group that are generally accepted by that group	a belief (or system of beliefs) accepted as authoritative by some group or school