General Card Games:
* Spades: A trick-taking game where the goal is to win the most tricks.
* Solitaire: A family of single-player games where the goal is to stack cards in descending order by suit.
* Spit: A fast-paced trick-taking game where you try to get rid of your cards by matching them with cards on the table.
* Snap: A simple matching game where players try to be the first to call out "Snap!" when two matching cards are played.
* Skat: A German trick-taking game with bidding and a complex scoring system.
* Sheepshead: A trick-taking game with a unique scoring system and a bidding element.
* Screw Your Neighbor: A trick-taking game where players try to get rid of their cards by playing them in sequence.
* Speed: A fast-paced card matching game where players try to get rid of all their cards by matching them with the cards in the middle of the table.
* Strip Poker: A game where players lose clothing based on winning or losing hands. (Note: this game can be very inappropriate).
Other card games with 'S' in the title:
* Scotch (a type of bridge)
* Schwimmen (a German card game)
* Star Wars: The Card Game (a collectible card game)
* Suicide Kings (a shedding game)
* Set (a card matching game)
This is not an exhaustive list, but it gives you a good starting point for card games starting with 'S'. Let me know if you'd like to learn more about any of these games!