Scare Card
A card that may turn a good hand into a bad hand. For example, the player has Td-8d and the flop comes Qc-Jc-9s. A turn card of Tc would be very scary because it would almost guarantee that the player will be beaten..

Scoop
To win the entire pot (high-low split pot game).

Second Pair
A pair with the second highest card on the flop..

Sell
In a spread limit game, to bet less than the maximum when you have a very strong hand, hoping players will call whereas they would not have called a maximum bet.

Semi Bluffing
Betting on a hand which is not the best hand, but has a reasonable chance of being improved.

Set
Three of a kind if the player has 2 of the ranks in hand and the other one on the flop.

Seven Card Stud Poker
Each player is dealt seven cards of their own. Two down,  four up, and a final card down. There is a round of betting after the first up card and after each subsequent card dealt..

Seventh Street
This applies to Seven Card Stud Poker. This is the fifth and final round of betting and at this point the players have seven cards each.

Shill
A proposition player in a poker game who plays with the cardroom's money.

Short Stack
A player who has the least number of chips compared to the other players at the table is said to be short-stacked.

Showdown
Showing the cards after all community cards have been dealt and all betting is completed to figure out who won the game.

Side Pot
A separate pot created has a player has no interest in because he ran out of chips..

Sixth Street
In Seven Card Stud Poker, the fourth round of betting is called Sixth Street because each player has six cards.

Sixth Street Card
In Seven Card Stud, this is the fourth face-up card dealt to the player.

Slow Play
Playing a strong hand as weak by not betting in order to conceal the strength of the hand.

Small Blind
The player to the immediate left of the button.

Splashing the Pot
Throwing chips into the pot in an unorganized fashion rather than moving stacks of chips.

Split Pair
A pair with one card up and the other down in Stud Poker..

Split Pot
A pot that is split between two or more players because they each have equivalent hands.

Split Two Pair
A two pair hand in which one of your card's ranks appears on the board.

Spread Limit
Betting limits in which there is a fixed minimum and maximum bet for each round of betting.

Straddle
An optional extra blind bet equal to twice the amount of the big blind, typically made by the player to the left of the big blind.

Straight
A hand composed of five cards of consecutive ranks.

Straight Flush
A hand composed of five cards of consecutive ranks of the same suit.

Structure
The structure of a poker game is the limits put on the blinds, antes, bets, and raises in any particular game.