rooter
nounOne who roots for the success of his patron or his side; specifically, in base-ball and other outdoor contests, one who gives aid and encouragement to his side by applause and by shouting advice.
nounOne who or that which roots or roots up, or tears up by the roots; one who eradicates or destroys.
nounA plant (or, figuratively, some other thing, or a person) which takes root.
nounOne who, or that which, roots; one that tears up by the roots.
nounOne who roots, or applauds.
nounOne who, or that which,
an enthusiastic devotee of sports