1. Hard as granite
   - granitic, rocklike, stony

See also: hard

• yellow perch
• yellow peril
• yellow pimpernel
• yellow pine
• yellow pitcher plant
• yellow pond lily
• yellow poplar
• yellow prussiate of potash
• Yellow race
• Yellow River
• yellow rocket
• yellow root
• yellow salsify
• yellow sand verbena
• Yellow Sea
• yellow spiny daisy
• yellow spot
• yellow spot fungus
• yellow spruce
• yellow squash
• yellow star-thistle
• yellow sweet clover
• yellow trefoil
• yellow trumpet
• yellow turnip