Piolet and Preliminary

Piolet noun - An ax used by mountain climbers for cutting footholds in ice.

Preliminary and piolet are semantically related. In some cases you can use "Preliminary" instead an adjective "Piolet".

Preliminary adjective - Coming before the main part or item usually to introduce or prepare for what follows.

Piolet and preliminary are semantically related. Sometimes you can replace term "Piolet" with "Preliminary", this adjectives are similar.