break
One word that rhymes with "cup" and starts with "B" is "blup."
A word that rhymes with blue and starts with B is "blew," which is the past tense of the verb "blow."
Bostitch Blair Witch
brick
bule
Butt, buzzcut
resilient
bundamentalls
brick
ball
brook
There are no words that start with B and rhyme with abrasive.