pluralism vs doctrine

pluralism and doctrine both are nouns.

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

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

pluralism: the doctrine that reality consists of several basic substances or elements
doctrine: a belief (or system of beliefs) accepted as authoritative by some group or school

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

pluralism (noun)	doctrine (noun)
the practice of one person holding more than one benefice at a time	a belief (or system of beliefs) accepted as authoritative by some group or school
the doctrine that reality consists of several basic substances or elements
a social organization in which diversity of racial or religious or ethnic or cultural groups is tolerated