The Aberdonian faced Allan Simmons, 56, from Coldingham in the Borders, at the final played today in London.
Allan was declared the winner after a gruelling best-of-five showdown against Simmons, finally winning in the fourth game.
He sealed his win by playing bandura, a type of Ukrainian lute, which scored him 86 points and gave him an unassailable lead in the deciding match.
The last match finished with an overall score of 503 for Allan, beating Simmons' 389.
Other words played in the final included kernite, a type of mineral, and exordial, which means the opening section of a speech.
Allan said: "I am delighted to have won, especially given the fact that the final is played to a public audience of players who expect to be impressed.
"Simmons played exceptionally well and was a delight to compete with."
As well as achieving the ultimate accolade for any Scrabble fan, teacher Allan also won £2500 in cash.
He was previously crowned champion in 2007 and has won a number of tournaments since starting to play Scrabble at a competitive level in 1993.
Allan enjoys the game's unique combination of language and strategy and, aside from Scrabble, takes part in athletics and juggling.
Runner-up Simmons, 56, has been playing Scrabble since the mid-1970s and won the National Scrabble Championship in 2008.
Both men were revising lists of thousands of words ahead of today's final.
There are around 40 Scrabble clubs across Scotland, with a dedicated organisation affiliated to the Association of British Scrabble Players (ABSP).
Amy Byrne, 62, chair of the Scottish Scrabble Association, said it was regrettable that while schools often encouraged chess clubs, they did not set up Scrabble clubs.
Byrne says the association are currently seeking sponsors to run a "Commonwealth Games" tournament, planned to coincide with the end of the actual Games and have teams of international competitors playing in Glasgow.