Their FAQ claims 60,000 ("The word list should contain almost all English words...") so 48k+ works known, which is somewhat more believable. OED 2nd Edition (19

Their FAQ claims 60,000 ("The word list should contain almost all English words...") so 48k+ works known, which is somewhat more believable. OED 2nd Edition (1989) has 171k full, current entries [1] (and another 47k obsolete, which I will disregard), so 137k+ words, which is quite a few but perhaps not beyond the realm of imagination. [1] https://en.oxforddictionaries.com/explore/how-many-words-are-there-in-the-english-language https://en.oxforddictionaries.com/explore/how-many-words-are...