The number of words in the English language is difficult to pin down exactly because English is constantly evolving, with new words being added and old ones falling out of use. However, here are some key points to consider:

• Estimated total words: The Oxford English Dictionary (OED), one of the most comprehensive sources, lists approximately 600,000 to 700,000 words, including historical and obsolete terms.
• Current active vocabulary: Most native speakers actively use between 20,000 and 35,000 words.
• Technical and scientific terms: When including specialized jargon, scientific terms, and slang, the total number can increase significantly.
• New words: English frequently adopts new words from technology, culture, and other languages, so the count is always growing.

Summary

• Approximate total words: 600,000–700,000 (including obsolete and rare words)
• Active vocabulary of a typical speaker: 20,000–35,000 words
• Constant growth: New words added regularly

If you want, I can also share how dictionaries decide which words to include or how new words enter the language!