From WordNet (r) 3.0 (2006) [wn]:
sharpener
n 1: any implement that is used to make something (an edge or a
point) sharper; "a knife sharpener"
From WordNet (r) 3.0 (2006) [wn]:
sharpener
n 1: any implement that is used to make something (an edge or a
point) sharper; "a knife sharpener"