[threepipeproblm]

Eventually the correct spelling is driven by usage, and 'extrovert' is currently listed in dictionaries so... it's correct.

Historically the term was 'extravert' in psych literature. I feel like more technical usage probably still leans that way.

[Bakary]

The matching vowels make it a better spelling.

[pbhjpbhj]

Do you mean matching each other or matching pronounciation?