​pioneer

​(noun) A pioneer is an early developer or explorer of something.

​prototype

(noun) A prototype is an early version of something. When inventors develop something, they usually move through a large number of pro​totypes before arriving at the final product.

​setbacks

​(noun) Setbacks are obstacles that block your progress or even send you backwards.

​drawback

​(noun) A drawback is a disadvantage or negative consideration.

brainchild

​(noun) A brainchild is the fruit of your imagination.

brainwave

​(noun) To have a brainwave is to come up with a new idea.

​breakthrough

​(noun) A breakthrough is an important development or achievement.

​breakdown

​(noun) A breakdown is the failure or ending of a system, plan or discussion.

​innovation

​(noun) An innovation is a new thing or method of doing something.