inwardness vs spiritism

inwardness and spiritism both are nouns.

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

As nouns, spiritism is a hyponym of inwardness; that is, spiritism is a word with a more specific, narrower meaning than inwardness:

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

Other hyponyms of inwardness include otherworldliness, spiritualism, spirituality.

inwardness (noun)	spiritism (noun)
the quality or state of being inward or internal	concern with things of the spirit
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