Sure Things are things that are certain and reliable. Antiperspirants (15 letters) are products used to reduce sweating and body odor. CINCHES (7 letters) are sure things, as they refer to something that is easily accomplished or secured. Slamdunks (9 letters) are also sure things, as they refer to a basketball shot that is almost guaranteed to go in the hoop. Deathandtaxes (13 letters) is a phrase often used to describe two sure things in life.