rib joint pliers vs plyers

rib joint pliers and plyers both are nouns.

Word	Noun	Adjective	Verb	Adverb
rib joint pliers	Yes	No	No	No
plyers	Yes	No	No	No

As nouns, plyers is a hypernym of rib joint pliers; that is, plyers is a word with a broader meaning than rib joint pliers:

rib joint pliers: a type of pliers, the pivot of which may be moved to expand its gripping range
plyers: a gripping hand tool with two hinged arms and (usually) serrated jaws

Other hypernyms of rib joint pliers include pair of pliers, pliers.

rib joint pliers (noun)	plyers (noun)
a type of pliers, the pivot of which may be moved to expand its gripping range	a gripping hand tool with two hinged arms and (usually) serrated jaws