hammerhead, hammerhead shark
['echidna, spiny anteater, anteater', 'cleaver, meat cleaver, chopper', 'dingo, warrigal, warragal, Canis dingo', 'spiny lobster, langouste, rock lobster, crawfish, crayfish, sea crawfish', 'rule, ruler', 'projectile, missile', 'tusker']