If you are interested in pigeons as a hobby, then you need to get to know some common pigeon terms. This is by no means a comprehensive list, but just a starter for someone who wants to get to know the hobby better. Here is a list:
Band - a band is a piece of plastic with information on it, that is added to the pigeon's leg when it is a baby (usually a week or so old). It is commonly added to the right leg. It has various information on it, such as the owner's phone number, a unique ID number, pigeon's month/year of birth, etc.
Bib - a colorful area on the front of a pigeon's neck. Yes, sometimes it looks like a bib on a baby. Or the pigeon is about to feast on lobster.
Cock - a male pigeon.
Coo - the general name for the sounds that pigeons make, usually during courtship.
Coop (also known as a "Loft") - the structure or 'house' that pigeons live in.
Crop - the 'stomach' located under the pigeon's neck. Food sits here for a while before passing through the rest of the digestive system. This is where the food is stored for feeding the babies.
Fancier - the name given for a person who devotes his entire time (spare or otherwise) raising pigeons. A fancier usually raises the hoity-toity pigeons he or she can show off. He or she probably races pigeons as well.
Hen - female pigeon.
Squab - a baby pigeon.
In addition, there are some general breeds of pigeons that should be known:
Carrier - probably the most well-known breed of pigeons. Originating in Persia (Iran), these pigeons were bred to carry messages.
Homer - this breed has a few sub-breeds, but the most common is the Racing Homer. As the name suggests, these birds race in competitions all over the world.
Rock Dove - the common pigeons that rule downtown and urban areas.
Tumbler - a pigeon breed that 'tumbles' in the air. As it is flying it occasionally does what looks like a backflip in the air. They are considered to be good flyers.