Dove has two completely different meanings:

1. A type of bird known for its gentle nature and soft cooing sound. Doves are related to pigeons but typically smaller and more delicate. They appear in many stories and symbols as representations of peace: you might see a white dove carrying an olive branch on peace posters or greeting cards. In real life, doves eat seeds and build simple nests, and many species mate for life. The most common wild dove in North America is the mourning dove, named for its sad-sounding call.
2. The past tense of the verb dive, meaning to plunge headfirst into water or drop suddenly downward. When you say “she dove into the pool,” you're describing how she jumped in. A goalkeeper might have dove to block a shot. Eagles dove from the sky to catch fish. (Some people say “dived” instead of “dove” for the past tense, and both are correct, though “dove” is more common in American English.)

You'll know which meaning from context: birds don't usually dive into pools, and past-tense actions don't coo or eat seeds.