Imaginer

Example:While she was an imaginer, he was a realist who insisted on hard evidence before he would believe anything.

Definition:A person who accepts or believes only in what is demonstrably true or can be experienced directly by the senses.

Example:His practical approach to problem-solving stood in stark contrast to the imaginer's tendency to let ideas run wild.

Definition:Concerned with practical applications and results, not with theoretical or academic matters.