This does look like a Bradford Pear, but contrary to what the others say, it has gorgeous white flowers in spring and beautiful red and orange foliage in fall. Some of the overproduction of vertical branches should be pruned out early in its life and then it will live to past 20 years old.

Looks like a Bradford pear. These invasives aren’t going to set fruit, and don’t live very long (15years or so), there’s not much reason to keep it unless you need it for cross pollination with the real pears, or want to try your hand at grafting.

That is a form of pear. It produces very small useless fruit. Best to get rid of it, or you will have many more. Buck

Looks like a wild pear. Check this previous post to Walter: http://www.walterreeves.com/gardening-q-and-a/bradford-pear-fruit-and-thorns/ One such wild child is the Callery pear, Pyrus calleryana.