Noun

• S: (n) loon (a worthless lazy fellow)
• S: (n) loon, diver (large somewhat primitive fish-eating diving bird of the northern hemisphere having webbed feet placed far back; related to the grebes)
• member holonym
• direct hypernym / inherited hypernym / sister term
• S: (n) addle-head, addlehead, loon, birdbrain (a person with confused ideas; incapable of serious thought)