What's the difference between breakwater and enrockment?

Breakwater

Definition:

(n.) Any structure or contrivance, as a mole, or a wall at the mouth of a harbor, to break the force of waves, and afford protection from their violence.

Example Sentences:

(1) The breakwater was ultimately completed after much delay and extra expense.
(2) The beaches are sandy and pleasant for sitting on at low tide, with breakwaters every 100 metres or so that also act as windbreaks.
(3) A meeting meant to reassure Cornish householders over plans for his private company, Shire Oak, to reopen a quarry near the Lizard peninsula to provide rock for the Swansea Bay breakwater, only seemed to reinforce opposition.
(4) Last year alone, the island, not much bigger than a breakwater in the Oslo fjord, played host to visitors from 25 international media organisations, all keen to find out the secret of Nilsen's success.
(5) Reefs also play a crucial role as natural breakwaters, protecting coastlines from storms.
(6) "The collapsed wall has been shored up with material salvaged from the damaged section, a temporary breakwater made of shipping containers filled with waste has been erected off the coast, removal of the damaged platform continues, and work is estimated to be completed by 18 March," he said.
(7) Until the late 1980s, nestled behind the Yan Ma Tei breakwater in Hong Kong's Causeway Bay, you could find tens of thousands of boat-dwellers who formed a bustling, floating district.
(8) Public broadcaster NHK showed images of a large ship ramming into a breakwater in Kennuma city, Miyagi prefecture.
(9) To protect the site, 15 steel containers – weighing around 70 tonnes each – have been installed as temporary breakwater, and a scaffold bridge has been built to reconnect services and signalling equipment.
(10) Global warming, overfishing and human intervention – especially breakwaters that protect sandy beaches but provide a home for larvae – are all blamed.
(11) Chelsea’s Guus Hiddink envious of squad options available to PSG Read more Still, though, at times it was hard to avoid the impression as PSG’s attacks crashed against the Chelsea breakwaters that Ibrahimovic’s best qualities – virtuoso touches, the irresistible imperative that the team play through him – are less likely to unsettle the stronger teams in Europe than they are the routinely terrorised defences of Ligue 1.
(12) Breakwaters that made up the typhoon shelter also limited water circulation, leaving pollution to accumulate in the harbour .
(13) The project, which envisages an area of 11.5 sq km cordoned off by a breakwater, would have an installed capacity of 320MW with an annual output of 420GWh and a design life of 120 years.
(14) A public authority building a breakwater and other harbour facilities at a small seaport (population 3000) had short-term requirements for 261,000 tonnes of rock and ultimately for 1,000,000 tonnes.
(15) The Cornish stone would be used to build a six-mile long breakwater in Swansea amid hopes of generating significant shipping volumes in a newly-created marine conservation zone.
(16) When working to build big cement breakwaters, he slept on top of a container just off the coastal highway.
(17) In 2003 Eitan became logistics manager for a project to extend Ashdod's port breakwater, which is where he drowned.