shear vs shearer

shear and shearer both are nouns.

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

shear (noun)	shearer (noun)
a large edge tool that cuts sheet metal by passing a blade through it	a skilled worker who shears the wool off of sheep or other animals
(physics) a deformation of an object in which parallel planes remain parallel but are shifted in a direction parallel to themselves	a workman who uses shears to cut leather or metal or textiles

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