Sioux City
geographical name
ˈsü 
city on the Missouri River in northwestern Iowa population 82,684
- rock samphire
- rock sand
- rock sandwort
- rock saw
- rock saxifrage
- rock seal
- rock shell
- rock shrike
- rock shrimp
- rock snake
- rock snipe
- rock snot
- rock soap
- rock solid
- rock someone's world
- rock sparrow
- rock spiraea
- rock spray
- rock squirrel
- rock star
- rock starling
- rock stars
- rock stream
- rock sturgeon
- rock sucker