Mammoth Uncensored Word List:
23 words ending with b, 9 letters long

abcoulomb bafflegab beachcomb chemisorb chemosorb cockscomb currycomb disentomb dithyramb flashbulb honeycomb interclub jiggumbob lightbulb nightclub overscrub preabsorb spiderweb superbomb superclub toothcomb underclub whitecomb