* Dictionary Variations: The game uses a dictionary, but there are different versions of this dictionary across platforms and updates.
* Proper Nouns: The inclusion of proper nouns is debated. Some dictionaries include them, others don't.
* New Words: Language is constantly evolving, and new words are added to dictionaries over time.
However, we can make some estimates:
* Scrabble Dictionaries: Words With Friends is based on Scrabble, and the official Scrabble dictionary contains around 178,000 words.
* Other Estimates: Some estimates suggest Words With Friends uses a dictionary with around 150,000 to 200,000 words.
The best way to find out the exact number would be to contact Zynga, the game's developer.