sharer vs partaker

sharer and partaker both are nouns.

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

As nouns, sharer and partaker are synonyms defined as:

sharer and partaker: someone who has or gives or receives a part or a share

sharer (noun)	partaker (noun)
someone who has or gives or receives a part or a share	someone who has or gives or receives a part or a share