TWL / NASPA Dictionary: The North American Scrabble Word List
If you play Scrabble in the United States, Canada, or Thailand, the TWL (Tournament Word List) is your bible. Maintained by NASPA with approximately 190,000 words, it's stricter than the international SOWPODS list — and that strictness creates a different strategic landscape where word challenges carry real consequences.
History and Governance
The TWL has its roots in the original Official Scrabble Players Dictionary (OSPD), first published in 1978. As competitive Scrabble grew in North America, players needed a definitive authority separate from commercial dictionaries.
🧩 TWL Timeline
1978: First Official Scrabble Players Dictionary (OSPD1) published by Merriam-Webster.
1990s: TWL created as tournament-only list (includes offensive words removed from retail OSPD).
2009: NASPA takes over governance from Hasbro, renaming it the NASPA Word List (NWL).
Present: NASPA's Dictionary Committee reviews additions/removals. Updated editions published periodically.
NASPA (North American Scrabble Players Association) now has full control over the word list. Their Dictionary Committee — composed of experienced players and lexicographers — decides which new words enter the list and which are removed. The latest edition includes words from contemporary American English while maintaining strict inclusion criteria.
Word Count and Coverage
~190,000
Total valid words
107
Two-letter words
3
Countries using TWL
NASPA
Governing body
The TWL draws primarily from Merriam-Webster's Collegiate Dictionary and its associated unabridged edition. Words must meet specific criteria to be included: they must be common enough to appear in a standard American English dictionary, be between 2 and 15 letters, and not be abbreviations, proper nouns, or require hyphens.
💡 TWL vs OSPD
The TWL and OSPD contain the same words, with one key difference: the OSPD (sold in shops) removes offensive words, while the TWL (used in tournaments only) includes all valid plays regardless of content. Tournament players need the full list because excluding words creates adjudication problems.
Where TWL Is Used
TWL governs all NASPA-sanctioned competitive play. This covers a specific geographic region but includes some of the most active Scrabble communities in the world.
🇺🇸 United States
The largest competitive Scrabble community. All NASPA clubs and tournaments from local to national level use TWL exclusively.
🇨🇦 Canada
Canadian tournaments follow NASPA rules and use TWL. Despite being a Commonwealth country, Canada aligns with North American rather than international standards.
🇹🇭 Thailand
Thailand's competitive Scrabble scene historically uses TWL due to long-standing ties with NASPA governance, making it the only non-North American TWL country.
How Word Challenges Work Under TWL
The challenge system is one of the most distinctive features of North American Scrabble. Under TWL rules, every word played is subject to challenge — and getting it wrong costs you dearly.
✓ Successful Challenge
If a challenged word is NOT in TWL, the player who played it loses their turn and removes the tiles. The challenger suffers no penalty.
✗ Failed Challenge
If the challenged word IS valid, the challenger loses their next turn as a penalty. This creates a bluffing element — playing a word your opponent might think is fake.
This high-stakes system means TWL players must be confident in their word knowledge. Playing an obscure word you're not sure about is a calculated risk — if challenged and wrong, you lose your turn. But if your opponent incorrectly challenges a valid word, they lose theirs. Many expert games are decided by challenge decisions.
🔧 Technical Note
Some NASPA events now use a "void" challenge system where invalid words are simply removed with no penalty to either player. This is growing in popularity but the traditional double-challenge format remains the standard at most events.
Key Differences From SOWPODS
TWL is effectively a strict subset of SOWPODS. Every word in TWL is also in SOWPODS, but SOWPODS contains roughly 90,000 additional words that TWL rejects. These extra words come from British dialects, archaic English, and international sources.
Fewer two-letter words: TWL has 107 valid two-letter words compared to SOWPODS's 124. Missing words like ZO, CH, and GI limit board openings for TWL players.
No British regional words: Terms from British, Australian, South African, and Indian English that haven't crossed into American usage are excluded from TWL.
Stricter inclusion criteria: Words must appear in mainstream American dictionaries. SOWPODS draws from a wider range of lexicographic sources.
Different strategic landscape: Fewer valid words means fewer bingo possibilities and tighter board play. TWL games tend to be lower-scoring on average.
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