
The number of five-letter words in the Oxford English Dictionary (OED) is not publicly available. The OED is a historical dictionary that aims to include every word that has ever been used in the English language, so the number of five-letter words in it would be quite large, but it’s hard to give an exact number.
It’s important to note that the OED is constantly updated, new words are added and some words removed, therefore the number of five-letter words in the OED is not fixed and it’s hard to give a precise number.