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1. A worthless lazy fellow
    
2. Large somewhat primitive fish-eating diving bird of the Northern Hemisphere having webbed feet placed far back; related to the grebes
   - diver
    
3. A person with confused ideas; incapable of serious thought
   - addle-head, addlehead, birdbrain

Sounds like:

Derived forms: loons

Type of: bum [N. Amer, informal], deadbeat [informal], do-nothing [informal], gaviiform seabird, idler, layabout [informal], loafer, misfit, shirker [informal], slacker [informal]

Part of: Gavia, genus Gavia

Encyclopedia: Loon, Iran