Refers to a person or being that creates something. Capitalized 'Creator' can refer to a divine creator, but the Japanese word itself does not inherently carry religious weight; context determines whether it means a human inventor, artist, or a deity.
He is the creator of this robot.
In many religions, God is considered the Creator of the universe.
発明者 specifically means 'inventor' of a device or technology, whereas 創造者 can refer to any kind of creator, including artistic or divine.
Compound of 創造 (そうぞう, 'creation') and 者 (しゃ, 'person'). The kanji 創 means 'originate' or 'create', 造 means 'build' or 'make', and 者 is a common suffix for a person who does something.