monism vs doctrine

monism and doctrine both are nouns.

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

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

monism: the doctrine that reality consists of a single basic substance or element
doctrine: a belief (or system of beliefs) accepted as authoritative by some group or school

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

monism (noun)	doctrine (noun)
the doctrine that reality consists of a single basic substance or element	a belief (or system of beliefs) accepted as authoritative by some group or school