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

• unclimbable
• unclimbed
• uncling
• unclipped
• unclipt
• uncloak
• uncloaked
• uncloaking
• uncloaks
• unclog
• unclogged
• unclogging
• unclogs
• uncloister
• uncloistered
• uncloistering
• uncloisters
• unclose
• unclosed
• uncloses
• unclosing
• unclothe
• unclothed
• unclothes
• unclothing