Nice find Steve.
If memory serve correctly, Scrabble's official dictionary, is the Miriam-Webster Dictionary (3rd Edition). I could be wrong... It's been a loooong time since I played... (also scrabblewordfinder.org is a good source)
J
There's no single Scrabble Official Word List, as explained here:
https://www.wordplays.com/official-scrabble-word-lists/Scrabble® word lists are available in many languages for official tournaments, friendly games and brain training. There is not a single official Scrabble® word list for a myriad of reasons, including the fact that different languages warrant the use of their own unique lists, languages evolve and opinions differ about permissible words applicable to any of the several variations of crossword board games based on Scrabble®. Accordingly, just as lexicographers use restricted word lists of high-frequency words to produce simple definitions for published dictionaries, various word game player associations from different regions around the world produce an array of lexicons that are updated periodically and generally designate word lists differentiated by an edition number or the year of a particular version for competitive play. Word game aficionados generally reference the most renowned Scrabble word lists as acronyms, which are deciphered below with links to more detailed information about the most popular official and unofficial Scrabble word lists.
If I had to hazard a guess, I'd say Richard's dictionary is the Collins Word List for British tournaments, as all the words you didn't recognize were found in it.
CSW :: COLLINS SCRABBLE® WORDS (COLLINS)
The Collins Scrabble® Words word list, also known as simply Collins or the CSW, is the TWL counterpart for official British Scrabble® tournaments. The Collins Scrabble® word list is sometimes referred to as CSTCWL, an acronym for Collins Scrabble Tournament and Club Word List.
It *is* an "official Scrabble list"; it's just not the one you're used to seeing and using in your part of the world.
Makes me wonder, since it's Brittish, can it use "color", "colour", or both versions of the spelling?
Feel free to follow the link I posted above and grab one of the other wordlists which seem more natural and native to the region you live in. From what I remember, it's easy enough to plug in a different dictionary into Richard's game here. :D