Fang and Piton

Fang noun - Canine tooth of a carnivorous animal; used to seize and tear its prey.

Piton and fang are semantically related. In some cases you can use "Piton" instead a noun "Fang".

Piton noun - A metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold.

Fang and piton are semantically related. Sometimes you can replace term "Fang" with "Piton", this nouns are similar.