The term 'Lively One' can be described by three crossword solutions: GRIG (4 letters), DYNAMO (6 letters), and JUMPINGJACK (11 letters). GRIG is a term used to describe a lively, cheerful person, while DYNAMO is a term used to describe someone with great energy and enthusiasm. Finally, JUMPINGJACK is a term used to describe someone who is very active and full of life. All three terms are used to describe someone who is energetic and full of life.