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

• paternalistic
• paternally
• paternities
• paternity
• paternity leave
• paternity suit
• paternity suits
• paternity test
• paternity tests
• paternoster
• paternosters
• pater patriae
• paters
• Paterson's curse
• pates
• -path
• path
• path.
• Pathan
• path-breaking
• pathed
• -pathetic
• pathetic
• pathetical
• pathetically