There are millions and trillions of words!
The fact is that no one knows. It can't even be said for certain how many words are in the English language, let alone all the languages of the world. The Oxford English Dictionary, considered to be the most complete dictionary of English, contains 291,500 entries. But it has happened more than once, that I've gone to the OED to look up a word and not found it. New words are constantly being coined, or borrowed, into the language, while others drop out of use.
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There are millions of words in all of the world's languages. Not to mention that many words have multiple meanings, rather than separate words for every use. In English, one estimate is about 250,000 words (170,000 in the Oxford Dictionary alone) and there are new words being created every day, even as some become archaic and rarely used.
Twilight has 115,362 words in it.
407 words
34 words (not including single letter words)
No words in the English language begin with the letters ss.