extroversion vs extraversion

extroversion and extraversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
extroversion	Yes	No	No	No
extraversion	Yes	No	No	No

As nouns, extroversion and extraversion are synonyms defined as:

extroversion and extraversion: (psychology) an extroverted disposition; concern with what is outside the self

extroversion (noun)	extraversion (noun)
(psychology) an extroverted disposition; concern with what is outside the self	(psychology) an extroverted disposition; concern with what is outside the self