sharer vs pooler

sharer and pooler both are nouns.

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

As nouns, pooler is a hyponym of sharer; that is, pooler is a word with a more specific, narrower meaning than sharer:

sharer: someone who has or gives or receives a part or a share
pooler: someone who shares in and contributes to a general fund for use by all

sharer (noun)	pooler (noun)
someone who has or gives or receives a part or a share	someone who shares in and contributes to a general fund for use by all