IPA: /ˈfæsbɔːlər/
KK: /ˈfæsbɔːlər/
A person who throws fastballs, typically in baseball or softball.
The fastballer struck out three batters in a row during the game.
Fastballer → The word is formed from "fast" (from Old English *fæst*, meaning firm or swift) and "baller" (derived from the word "ball" with the suffix "-er" indicating a person who plays with a ball). A fastballer is a person who throws a fast ball, particularly in baseball.
Think of someone who is 'swift' ('fast') and is a 'player' ('-er') of a ball game. This helps you remember that a fastballer is someone who throws the ball quickly.