share vs sharer

share and sharer both are nouns.

Word	Noun	Adjective	Verb	Adverb
share	Yes	No	Yes	No
sharer	Yes	No	No	No

share (noun)	sharer (noun)
the allotment of some amount by dividing something	someone who has or gives or receives a part or a share
the effort contributed by a person in bringing about a result
a sharp steel wedge that cuts loose the top layer of soil
assets belonging to or due to or contributed by an individual person or group
any of the equal portions into which the capital stock of a corporation is divided and ownership of which is evidenced by a stock certificate

share (verb)	sharer (verb)
communicate
give out as one's portion or share
have, give, or receive a share of
use jointly or in common
have in common