4 letters:
bran, brau, bren, brin, brow, brun, bryn

5 letters:
brain, brann, braun, brawn, brean, breen, brenn, brine, brinn, bronn, broun, brows, bruen, bruhn, brune, brunn, bruun, bryne, crown, drown, frown, brown

6 letters:
brauer, braune, brough, brouse, browed, brower, browns, browse, crowne

7 letters:
brown's, browned, browner, brownie, browns'

8 letters:
brougher