spiritism vs inwardness

spiritism and inwardness both are nouns.

Word	Noun	Adjective	Verb	Adverb
spiritism	Yes	No	No	No
inwardness	Yes	No	No	No

As nouns, inwardness is a hypernym of spiritism; that is, inwardness is a word with a broader meaning than spiritism:

spiritism: concern with things of the spirit
inwardness: preoccupation with what concerns human inner nature (especially ethical or ideological values)

Other hypernyms of spiritism include internality.

spiritism (noun)	inwardness (noun)
concern with things of the spirit	the quality or state of being inward or internal
	preoccupation with what concerns human inner nature (especially ethical or ideological values)
	preoccupation especially with one's attitudes and ethical or ideological values
	the choicest or most essential or most vital part of some idea or experience