plyers vs compound lever

plyers and compound lever both are nouns.

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

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

plyers: 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 plyers include hand tool.

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