introvert vs introversion

introvert and introversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
introvert	Yes	No	Yes	No
introversion	Yes	No	No	No

introvert (noun)	introversion (noun)
(psychology) a person who tends to shrink from social contacts and to become preoccupied with their own thoughts	(psychology) an introverted disposition; concern with one's own thoughts and feelings
	the folding in of an outer layer so as to form a pocket in the surface
	the condition of being folded inward or sheathed

introvert (verb)	introversion (verb)
turn inside
fold inwards