1. Could not

Encyclopedia: Couldn't

• slipstream
• slipway
• slit
• slit lamp
• slit trench
• slither
• slithering
• slithery
• sliver
• slivery
• slivovitz
• Slo-Bid
• Sloane Ranger
• Sloanea
• Sloanea jamaicensis
• slob
• slobber
• slobber over
• slobberer
• slobbish
• sloe
• sloe gin
• sloe-eyed
• slog
• slogan