* A physical dictionary: These vary greatly in size. A pocket dictionary might have only a few hundred words, while a large unabridged dictionary could contain hundreds of thousands of words and definitions.
* An online dictionary: These can be even larger, as they are constantly being updated with new words and definitions. The largest online dictionaries, like Merriam-Webster or Oxford English Dictionary, contain millions of words.
* A language model's vocabulary: This is a different concept altogether. Large language models (LLMs) like ChatGPT have a vast vocabulary that's not a dictionary in the traditional sense. They don't simply store words and definitions but learn patterns and relationships within language. These models can have vocabularies of billions of words, but it's more accurate to think of it as a "knowledge base" rather than a dictionary.
So, to give you a more specific answer, I need to know what kind of dictionary you're interested in.
Could you clarify what you're looking for?