This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. One that is original or innovative.

n. First person to do, make or fight for something. A pioneer; a seminal person.

n. someone who helps to open up a new line of research or technology or art

"But I have to say I feel like "groundbreaker" should be reserved for props that actually, you know, appear to break out of the ground."

conceiver    originator    mastermind