- dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, fuckhead - these words are used to express a low opinion of someone's intelligence
--1 is a kind of simpleton, simple
- hammerhead - the striking part of a hammer
--2 is a kind of head
--2 is a part of hammer
--2 has part: peen- hammerhead, hammerhead shark - medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous
--3 is a kind of shark
--3 is a member of Sphyrna, genus Sphyrna
--3 has particulars:smooth hammerhead, Sphyrna zygaena; smalleye hammerhead, Sphyrna tudes; shovelhead, bonnethead, bonnet shark, Sphyrna tiburo - hammerhead, hammerhead shark - medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous