Information: - The curveball is a type of pitch in baseball thrown with a characteristic grip and hand movement that imparts forward spin to the ball , causing it to dive in a downward path as it approaches the plate . Its close relatives are the slider and the slurve . The '' curve '' of the ball varies from pitcher to pitcher . Outside the context of baseball , variants of the expression '' to throw a curveball '' essentially translate to introducing a significant deviation to a preceding concept . - A portmanteau (; plural "portmanteaus" or "portmanteaux" ) or portmanteau word is a linguistic blend of words, in which parts of multiple words or their phones (sounds) are combined into a new word. as in "smog", coined by blending "smoke" and "fog", or "popportunity", from "popping" and "opportunity", or "motel", from "motor" and "hotel". In linguistics, a portmanteau is defined as a single morph that represents two or more morphemes. - In baseball, a slider is a breaking ball pitch that tails laterally and down through the batter's hitting zone; it is thrown with speed less than a fastball but greater than the pitcher's curveball. - The slurve is a baseball pitch in which the pitcher throws a slider as if it were a curve ball. The term is a portmanteau of slider and curve. - Baseball is a bat-and-ball game played between two teams of nine players each, who take turns batting and fielding. - In baseball, the pitcher is the player who throws the baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk. In the numbering system used to record defensive plays, the pitcher is assigned the number 1. The pitcher is often considered the most important defensive player, and as such is situated at the right end of the defensive spectrum. There are many different types of pitchers, such as the starting pitcher, relief pitcher, middle reliever, lefty specialist, setup man, and closer. - The fastball is the most common type of pitch thrown by pitchers in baseball and softball. "Power pitchers," such as former American major leaguers Nolan Ryan and Roger Clemens, rely on speed to prevent the ball from being hit, and have thrown fastballs at speeds of 95105mph (152.9169.14km/h) (officially) and up to 108.1mph (174km/h) (unofficially). Pitchers who throw more slowly can put movement on the ball, or throw it on the outside of home plate where batters can't easily reach it. - In baseball, a breaking ball is a pitch that does not travel straight as it approaches the batter; it will have sideways or downward motion on it, sometimes both (see slider). A breaking ball is not a specific pitch by that name, but is any pitch that "breaks", such as a curveball, slider, or cutteralso known as a cut fastball. A pitcher who primarily uses breaking ball pitches is often referred to as a junkballer. Given the paragraphs above, decide what entity has the relation 'subclass of' with 'breaking ball'.
Answer:
curveball