Compound lever and Pair of pliers

Compound lever noun - A pair of levers hinged at the fulcrum.

Pair of pliers and compound lever are semantically related. In some cases you can replace phrase "Pair of pliers" with "Compound lever", this phrases are similar.

Pair of pliers noun - A gripping hand tool with two hinged arms and (usually) serrated jaws.

Compound lever and pair of pliers are semantically related. You can use "Compound lever" instead a noun phrase "Pair of pliers".