1.
collaborator; cooperator; supporter
A person who provides assistance or works together with others toward a common goal.
Composed of 協力 (cooperation) + 者 (person). Used in academic, investigative, and organizational contexts to describe someone who contributes effort or information.
Common collocations
- 協力者を募る — recruit cooperators
- 協力者を求める — seek collaborators
- 内部協力者 — insider collaborator, informant
- 調査協力者 — research participant/collaborator