1. Slender aspen native to North America
   - American aspen, Populus tremuloides

Type of: aspen

• shutter
• shutterbug
• shuttered
• shutting
• shutting post
• shuttle
• shuttle bus
• shuttle diplomacy
• shuttle helicopter
• shuttlecock
• shuttlecock fern
• shwa
• shy
• shy away from
• shy person
• shylock
• shyly
• shyness
• shyster
• si
• SI system
• SI unit
• sial
• sialadenitis
• Sialia