noun
Refers to a person who creates or devises something new, especially a device, process, or method.
エジソンは電球の発明者として知られている。
Edison is known as the inventor of the light bulb.
彼女は若い発明者で、すでにいくつかの特許を持っている。
She is a young inventor who already holds several patents.
考案者 also means 'inventor' or 'deviser', but often implies devising a plan or idea rather than a physical invention. 発明者 is more strongly associated with technological inventions.
Compound of 発明 (invention) + 者 (person). The word follows a common pattern for agent nouns in Japanese.