church doctrine vs doctrine

church doctrine and doctrine both are nouns.

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

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

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

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

church doctrine (noun)	doctrine (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