Aphabetic letter pairs in words

BO - hobo

BP - subportion

BQ: BBQ! (apparently, no BQ words)

Sure there are: subquery. Anyway, BR: bread.

BS: absolute

BT: obtain

BU = abut

BV: obverse.

BW = subway

BX: subxiphoid.

BY: by

BZ = Abzug, Bella

CA: cacophony

CB: ecbasis.

CC = Ecclesiastical

CD: anecdotal

Or just take a quaalude and the problem goes away.

CE = processional

CF: (coefficient of friction - no CF word!)

Yes there is. In microbiology, McFarland standards are used as a reference to adjust the turbidity of bacterial suspensions