tooth: a tooth in the mouth, and by extension anything tooth-shaped, hard, or sharp like one
At its core this word names a tooth, whether a person's or an animal's. From that one picture the Hebrew reaches out in several directions, each tied to the shape, hardness, or use of a tooth.
A tooth bites, grinds, and tears, so teeth stand in for hostility and appetite: enemies grind their teeth in rage, the wicked bare their teeth like a beast, and a famine leaves people with nothing to chew. The law's measured penalty "tooth for tooth" treats the tooth as a fixed unit of bodily harm to be repaid in kind.
Because an elephant's tusk is simply a great tooth, the same word becomes the ordinary Hebrew term for ivory, the prized white material of thrones, beds, panels, and palaces. Because a crag of rock juts up sharp and white like a tooth, a high cliff can be called a tooth of rock. And the pointed prong of a flesh-hook is a tooth as well. In every case the reader is meant to feel the underlying image of a tooth: hard, sharp, and white.