The 36-year, who hails from Delta State, defeated Lewis Mackay of Cambridge, England, by 448 points to 426 points in the final which was contested by 450 players from around the world.
He is the first black African to win the Championship.
His landmark achievement received a moral boosting call from President Muhammadu Buhari, who congratulated him for making Nigeria proud.
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Buhari said “I called to rejoice with you over your performance. You have done the country proud, and we are very happy. Please, pass my congratulations to other members of Team Nigeria.”
The five other Nigerian representatives finished in the top 50 scrabble players in the world bracket.