Examples of six letter words with the third letter 'b' are:
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -UB-UB. That is, six letter words with 2nd letter U and 3rd letter B and 5th letter U and 6th letter B. In alphabetical order, they are: hubbub
Botany.
beer
brainbaconbatonbeginbegunbaronbasinblownbrawnbrownbruin
Bravery.
Benumb is a 6 letter word. It means to make numb.
wobbling
babysit
sybass
genres
berets
Botany.
babies
Botany
The word is oblige.
hubbub; entomb; bicarb
Cobweb does, as does Cherub.