pliers vs compound lever

pliers and compound lever both are nouns.

Word	Noun	Adjective	Verb	Adverb
pliers	Yes	No	No	No
compound lever	Yes	No	No	No

As nouns, compound lever is a hypernym of pliers; that is, compound lever is a word with a broader meaning than pliers:

pliers: a gripping hand tool with two hinged arms and (usually) serrated jaws
compound lever: a pair of levers hinged at the fulcrum

Other hypernyms of pliers include hand tool.

pliers (noun)	compound lever (noun)
a gripping hand tool with two hinged arms and (usually) serrated jaws	a pair of levers hinged at the fulcrum