rip-rap or riprap /ripˈrap/

1. Loose broken stones, used to form a foundation on soft ground or under water, or in the construction of revetments and embankments
2. A foundation formed of these

• shreddy
• shredless
• shred-pie
• shred-pies
• shreds
• shreek
• shreik
• shrew
• shrewd
• shrewder
• shrewdest
• shrewdie
• shrewdies
• shrewdly
• shrewdness
• shrewdnesses
• shrewed
• shrewing
• shrewish
• shrewishly
• shrewishness
• shrewishnesses
• shrewmice
• shrew mole
• shrew moles