This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Someone who throws.

n. Something that throws.

n. One who throws or twists silk; a throwster.

n. One who shapes vessels on a throwing engine.

n. A bowler who illegally throws the ball instead of bowling it.

n. The pitcher.

n. One who throws. Specifically: (a) One who throws or twists silk; a throwster. (b) One who shapes vessels on a throwing engine.

n. One who or that which throws.

n. A turner. See throw, n., 1.

n. a person who twists silk or rayon filaments into a thread or yarn

n. someone who projects something (especially by a rapid motion of the arm)

n. a craftsman who shapes pottery on a potter's wheel and bakes them it a kiln

"If they catch the ball, the thrower is out, and, in some leagues, the catcher's teammate comes back in the game."

worker   

flamethrower   

blower    dougher    goer    grower    knower    lower    mower    rower    slower    sower   

throwers    multivibrator    discharger    launchers    pourer