Pipe - A relatively inexpensive and easily concealed marijuana-smoking device. Typically, weed is placed in a cone on the end of a metallic cylinder, then lit and inhale.

A bong is a pipe with a small water-chamber known as a "bubbler"  through which thecannabis smoke passes prior to inhalation. Users fill the bong with water in order to cool the smoke and filter out particulate matter, sometimes also adding ice or using substances such as brandy in place of water. Ash Catchers, Diffusors, Percolators, and Carbon Filters are being seen more and more in modern glass bongs. Bongs may have a hole which is covered with a finger during inhalation and then uncovered to clear the pipe of smoke; slang names for this include: carb (short for carburetor), rush-hole, choke, "clear hole" or just "clear", shotgun, and shotty
(related; Blunt, Ace, Bong)