[Antibabelic]

Where do these numbers come from?

[xnx]

Multiple sources have those approximate numbers. Here's one: https://www.merriam-webster.com/help/faq-how-many-english-wo...

"Webster's Third New International Dictionary, Unabridged, together with its 1993 Addenda Section, includes some 470,000 entries. The Oxford English Dictionary, Second Edition, reports that it includes a similar number."