The terms "dove" and "pigeon" are used interchangeably, although smaller species are more likely to be called doves. The species commonly referred to just as the "pigeon" is the feral Rock Pigeon. It is related to the extinct dodo. The young doves and pigeons are called "squabs". A person who keeps pigeons is called a "pigeon fancier".
White-winged Dove. This is the most common bird in our backyard. We've had as many as 20 at one time, and one pair is currently nesting atop one of our covered patio pillars. They let the sparrows (and squirrels...grrr) knock food out of the feeders, then pick it up off the ground. They make very pleasant and peaceful neighbors.