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

• fructoses
• fructuaries
• fructuary
• fructuate
• fructuated
• fructuates
• fructuating
• fructuation
• fructuations
• fructuous
• frugal
• frugalist
• frugalists
• frugalities
• frugality
• frugally
• frugi-
• frugiferous
• frugivore
• frugivores
• frugivorous
• fruict
• fruicted
• fruicting
• fruicts