Buy, purchase mean to acquire something for money or an equivalent.
Buttress vs Pier vs Abutment
Buttress, pier, abutment are architectural terms for auxiliary structures designed to serve as a prop, shore, or support for a wall (as of a building).
Busy vs Industrious vs Diligent vs Assiduous vs Sedulous
Busy, industrious, diligent, assiduous, sedulous mean actively engaged or occupied in work or in accomplishing a purpose or intention.
Back to the drawing-board vs Back to the salt mines
back to the drawing-board—dealing with the same matter again (because smth. has gone wrong):
Business vs Commerce vs Trade vs Industry vs Traffic
Business, commerce, trade, industry, traffic are comparable chiefly when they denote one of the forms or branches of human endeavor which have for their objective the supplying of commodities.
Bridal vs Bridle
Bridal refers to a marriage ceremony.
Back to basics vs Back to square one
back to basics—returning to the previously held fundamental principles:
Breadth vs Breath vs Breathe
Breadth refers to distance, width, or scope.
Burn vs Scorch vs Char vs Sear vs Singe
Burn, scorch, char, sear, singe mean to injure by exposure to fire or intense heat.
Back off from something vs Back out of something
back off from something—withdraw from smth. one has promised or agreed to do:
Burden vs Encumber vs Cumber vs Weigh vs Weight vs Load vs Lade vs Tax vs Charge vs Saddle
Burden, encumber, cumber, weigh, weight, load, lade, tax, charge, saddle are comparable when they mean to lay a heavy load upon or to lie like a heavy load upon a person or thing.
Breach vs Breech
Breach is an infraction or violation of some kind.