reincarnationism vs doctrine

reincarnationism and doctrine both are nouns.

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

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

reincarnationism: a doctrine that on the death of the body the soul migrates to or is born again in another body
doctrine: a belief (or system of beliefs) accepted as authoritative by some group or school

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

reincarnationism (noun)	doctrine (noun)
a doctrine that on the death of the body the soul migrates to or is born again in another body	a belief (or system of beliefs) accepted as authoritative by some group or school