noun
originator; proposer; initiator
Refers to the person who first came up with a plan, idea, or proposal. Often used in formal or business contexts.
このプロジェクトの発案者は彼です。
He is the originator of this project.
新しい制度の発案者として知られている。
He is known as the proposer of the new system.
考案者 focuses on the person who devised or invented something, often a concrete method or device, whereas 発案者 is broader and can include abstract plans or initiatives.
Compound of 発案 (hatsuan, 'originating an idea') + 者 (sha, 'person'). The derivation is transparent from its components.