* No definitive list: There's no single, universally accepted list of all English words. Dictionaries vary in size and scope.
* Constantly evolving: New words are created and added to the language, while others become obsolete.
* Different forms: The letters "them" might appear in different forms within a word (e.g., "themselves", "themself", "thematic").
* Regional variations: Different dialects and regional variations of English have their own word sets.
What you can do:
* Search a dictionary: A large dictionary will have a vast number of words, so you can use the search function to find words containing "them." However, it will likely only be a partial count.
* Use a word list: There are online word lists that you can search. While they won't be comprehensive, they can give you a good estimate.
* Focus on a specific type of word: You could focus your search on a specific category, such as nouns, verbs, or adjectives, to get a more manageable result.
Ultimately, finding the precise number of words with "them" is a challenging task.