Which word that starts with 'b' and includes 'ler' is the most popular word in the dictionary? The most popular word for the combination you requested is butler.
In Scrabble, what is the best score you can get using words that start with 'b' and contain 'ler'? With an enormous 191 entries, your best choice is bicycler which scores 17 points.
Using that start with 'b' and include 'ler', what's the biggest word possible to derive? bellerophontidae (16 letters)
How many words can you make using this list? It's possible to derive 191 words using the letter combination you specified.
What word that starts with 'b' and includes 'ler' is the most unusual? Certainly one of the most unusual words from this page is backsettler. It means "One living in the back or outlying districts of a community. The English backsettlers of Leinster and Munster. Macaulay.".