The term ENERGETIC ONE can be described by the following crossword solutions: DYNAMO (6 letters), DOER (4 letters), PISTOL (6 letters), GOER (4 letters), DEMON (5 letters), and GOGETTER (8 letters). A DYNAMO is a machine that converts mechanical energy into electrical energy, so it is an apt description for someone who is energetic. A DOER is someone who takes action and gets things done, which is also a characteristic of an energetic person. A PISTOL is a type of firearm, and it can be used to describe someone who is forceful and determined. A goer is someone who is always on the move and never stops, which is a trait of an energetic person. A DEMON is a supernatural being with great power, and this can be used to describe someone who is full of energy and vigor. Finally, a go-getter is someone who is ambitious and determined to succeed, which is another way to describe an energetic one.