Similar in size, if you mean common pigeon as the rock dove.
The rock pigeon's scientific name is Columba livia.
A homing pigeon is just a variety of rock pigeon. A rock pigeon lives for 3 to 5 years in the wild, but for around 15 years in captivity.
Columbia livia. Common rock dove in the wild. Homing pigeon is one of several varieties of domesticated rock doves.
The name for the type of pigeon you see all over cities is the Rock Pigeon. It's scientific name is "Columba livia".
Europe. Introduced worldwide.
The homing pigeon is a variety of domestic pigeon derived from the Rock Pigeon selectively bred to find its way home over long distance
Rock dove, Pink pigeon, Eurasian collared dove, Wood-pigeon, Mourning dove, Magnificent fruit pigeon, New Zealand pigeon, Victoria crowned pigeon, Crowned sandgrouse and Namaqua sandgrouse.
The passenger pigeon (Ectopistes migratorius) is an extinct pigeon once found in North America. The homing pigeon is a domestic breed of the rock pigeon (Columbia livia) renowned for its ability to return to its own nest after being removed from it.
the rock dove.
Doves and pigeons form the family Columbidae. There are 289 known species in the world. The terms "pigeon", and "dove", are actually interchangeable, with pigeons normally referring to the larger species of the family. However, the rock dove is known as the feral pigeon of large cities.
Most pigeons are about the same size more of less than a rock pigeon unless they are the Victorian pigeon or the giant pigeon which are larger. Adult rock pigeons grow to a length of 32-37 cm (12-14 ½ inches) with a wingspan of 64-72 cm (25-28 inches). They are similar in size and plumage to the Stock Pigeon which migrates between Europe and Asia.