contributor
US /kənˈtrɪb.jə.t̬ɚ/
UK /kənˈtrɪb.jə.t̬ɚ/

1.
a person who contributes something, especially money, to a common fund or purpose
:
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She is a regular contributor to the charity.
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The company recognized its top contributors at the annual dinner.
2.
a person who writes articles for a newspaper, magazine, or website
:
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She is a freelance contributor to several online publications.
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The magazine features articles from various expert contributors.