1. As an adjective
   "nouns are frequently used adjectively"

See also: adjectival

• skulker
• skulking
• skull
• skull and crossbones
• skull practice
• skull session
• skullcap
• skullduggery
• skunk
• skunk bear
• skunk cabbage
• skunkbush
• skunkweed
• sky
• sky burial
• sky glow
• sky marshal
• sky pilot
• sky wave
• sky-blue
• sky-high
• skybox
• skycap
• skydive
• skydiver