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1141 five letter words start with B, and the letter after it is a vowel in nearly four cases out of five.
A takes about twenty one percent, E eighteen, O seventeen and U twelve. I adds another ten, so the vowels together carry close to eighty percent.
R and L split most of the remainder, which gives you the BR and BL blends.
BRAND, BRING, BREAK and BROWN sit on one, BLACK, BLOCK and BLOOD on the other. Together they are about a quarter of the group.
Both blends push the first vowel into the third box, which changes the shape of the word entirely compared with the BA and BE branches.
BOOKS, BLOOD and BOOTH all carry a doubled O. B reaches that shape more readily than most openings, so it is a cheap thing to test once an O appears.
BUILD and BUILT are the pair worth holding back. They sit on the smaller U branch and differ only in the last box, so one guess settles both.
BEACH tests E, A, C and H across four branches. BOARD repeats nothing either but its letters are commoner, so it rules out more on a miss.
B blends with only R and L in English. Every other combination needs a vowel, which pushes almost the whole group onto vowel branches.
Yes, both take U second and share their first four letters. The last box is the only thing separating them.