key contributor ( synonym found)
Definition of key contributor:

°A benefactor; someone who donates to charity or some cause.
"I am a longstanding financial contributor to Amnesty International."
°A person who backs, supports or champions a cause, activity or institution.
"He was a regular contributor to Greenpeace protests."
Definition of key contributor:

°A benefactor; someone who donates to charity or some cause.
"I am a longstanding financial contributor to Amnesty International."
°A person who backs, supports or champions a cause, activity or institution.
"He was a regular contributor to Greenpeace protests."
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