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

• tinnie
• tinnier
• tinnies
• tinniest
• tinnily
• tinniness
• tinninesses
• tinning
• tinnings
• tinnitus
• tinnituses
• tinny
• tin-opener
• tin-openers
• Tin Pan Alley
• tinplate
• tinplated
• tinplates
• tinplating
• tinpot
• tinpots
• tins
• tinsel
• tinseled
• tinseling