Pitching.
Hitting.
Baserunning.
Fielding.
General.
100
When the pitcher throws a pitch the catcher cannot handle
What is wild pitch
100
The hitter who follows the batter currently at the plate
What is on deck
100
A substitute base runner
What is pinch runner
100
A defensive baseball play that results in two outs
What is double play
100
When the pitcher throws four balls to a batter the batter gets to go to first base automatically
What is walk
200
A game where the pitcher or a team does not allow a single base hit
What is no hitter
200
A baseball that is hit outside the field of fair play
What is foul ball
200
A base runner on 2nd or 3rd base is in scoring position
What is scoring position
200
A defensive baseball play that results in three outs
What is triple play
200
The area an umpire uses to call balls and strikes
What is strike zone
300
A game where the pitcher or team does not allow a single hit or single runner on base the whole game
What is perfect game
300
A hitter who does not play a defensive position, but hits for the pitcher in certain Leagues
What is designated hitter
300
An attempt to get on base where the runner goes in feet first or head first; usually attempted when stealing a base
What is slide
300
A mistake in fielding the baseball by the defense that allows a batter to reach base or a base runner to advance
What is error
300

A specialized relief pitcher brought in to finish a game, typically in the final inning. 

Closer

400
The area where relief pitchers wait and prepare to enter the game
What is bullpen
400
The fourth batter in the lineup. Named this because their job is to 'clean up' the bases and drive in all runners on base
What is clean-up
400
When runners are on first, second, and third bases
What is bases loaded
400
A recorded out that doesn't leave the infield when the the ball has struck the ground at some point
What is groundout
400
When a score is tied after the completion of nine innings, then the innings it takes to break the tie and determine the winner are extra
What is extra innings
500
A pitch that move into, away from, or suddenly drops as it reaches the hitter
What is breaking ball
500
A hit over the outfield wall or a hit that allows the hitter to reach home plate
What is homerun
500
When a runner waits for a fly ball to legally be caught before taking off
What is tagging up
500
The side of the outfield behind shortstop toward third base
What is leftfield
500
The area where players, the manager, and coaches are when they're not in the field
What is dugout
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