BIP39 Words Starting with F (106 words)

The 106 BIP39 words that start with F run from #652 fabric to #757 future in the English wordlist: indexes 651 to 756, or 01010001011 to 01011110100 in binary. That is 5.2% of the 2048 words, the 9th-largest of the 25 letter groups. Word length goes from 3 letters (fan, fat and 8 more) to 8 (favorite, february and 2 more).

26 three-letter beginnings are shared by two or more words; the largest is "for", with 7 words. The 75 words in these groups need their first four letters to be told apart, while 31 are identified by the first three. The short words fan, fat, fee, fit and fun also begin longer ones, so a four-letter backup keeps them whole.

52 of the 106 words have look-alikes one letter away, such as face and fade. Read aloud, 100 pairs differ by a single sound, for example face and faith. Seven spellings are shared with the French BIP39 list, at different indexes: fatal, fatigue, festival and 4 more. 13 of the words appear in the official BIP39 test vectors, among them famous and fancy.