Estimates on the number of words in Hindi vary widely due to several factors, including:

• Lack of a Definitive Standard: Unlike some languages with central language academies that officially codify vocabulary, Hindi does not have a single, universally accepted authority that precisely counts and defines what constitutes a "word."
• Inclusion of Sanskrit and Urdu words: The vocabulary of Hindi draws heavily from Sanskrit and Urdu, and deciding which words to include significantly affects the count.
• Regional Variations and Dialects: Hindi has numerous regional dialects, and the inclusion of dialectal words can inflate the count.
• Evolving Language: New words are constantly being added to the language through neologisms, loanwords, and adaptations.

Some sources suggest that a comprehensive Hindi dictionary might contain 200,000 to 300,000 words, but the number of words commonly used is much smaller.

For more information, you can explore resources like:

• Britannica - Hindi Language