BIP39 Words Starting with B (117 words)

The 117 BIP39 words that start with B run from #137 baby to #253 buzz in the English wordlist: indexes 136 to 252, or 00010001000 to 00011111100 in binary. That is 5.7% of the 2048 words, the 6th-largest of the 25 letter groups. Word length goes from 3 letters (bag, bar and 4 more) to 8 (bachelor, broccoli and 1 more).

29 three-letter beginnings are shared by two or more words; the largest, with 6 words each, are "bri" and "bro". The 85 words in these groups need their first four letters to be told apart, while 32 are identified by the first three. The short words bar and bus also begin longer ones, so a four-letter backup keeps them whole.

48 of the 117 words have look-alikes one letter away, such as bag and bar. Read aloud, 69 pairs differ by a single sound, for example badge and bag. Four spellings are shared with the French BIP39 list, at different indexes: badge, bicycle, bonus and 1 more. Eight of the words appear in the official BIP39 test vectors, among them baby and behind.