First post here, please forgive me if wrong community...
By "opposite role", I mean like parent/child, brother/sister.
In organ transplants, the "opposite role" of donor would be recipient. But I'm referring to crowd funding, where the "opposite role" of donor is the person who created the crowd funding campaign that the donor is donating to. They are more than just a recipient, they create and manage their fund raising campaign. gofundme uses the term "campaign organizer" but I'm looking for a single word.
And BTW, what is the correct term for "opposite role"? It's not antonym or "opposite word", because it's not really an opposite relationship.
The best word for the reciprocal of donor in the context of crowd funding is fundraiser.
It's not a duplicate question because in this context which is more specific, we get a different answer. And the best answer for the word for "opposite role" is reciprocal (noun). (e.g., What is the reciprocal of parent? Answer: child)