Nouns

(n)eager beaver, busy bee, live wire, sharpie, sharpyan alert and energetic person
(n)cardsharp, card sharp, cardsharper, card sharper, sharper, sharpie, sharpy, card sharka professional card player who makes a living by cheating at card games
(n)sharpiea shallow-draft sailboat with a sharp prow, flat bottom, and triangular sail; formerly used along the northern Atlantic coast of the United States