shear vs shears

shear and shears both are nouns.

Word	Noun	Adjective	Verb	Adverb
shear	Yes	No	Yes	No
shears	Yes	No	No	No

shear (noun)	shears (noun)
a large edge tool that cuts sheet metal by passing a blade through it	large scissors with strong blades
(physics) a deformation of an object in which parallel planes remain parallel but are shifted in a direction parallel to themselves

shear (verb)	shears (verb)
become deformed by forces tending to produce a shearing strain
cut with shears
cut or cut through with shears
shear the wool from