What's the difference between parapet and terreplein?

Parapet

Definition:

(n.) A low wall, especially one serving to protect the edge of a platform, roof, bridge, or the like.
(n.) A wall, rampart, or elevation of earth, for covering soldiers from an enemy's fire; a breastwork. See Illust. of Casemate.

Example Sentences:

(1) Not only will these leave many more people vulnerable, not least the very young, but also make it even less likely that they or anyone else will be listened to, if they dare to raise their head above the parapet on their behalf.
(2) The impending publication of the putative nude pictures, a humiliation that turned out to be a bluff, might have pulled Watson down among the lower orders of former child stars, those people who now exist in the public consciousness merely as cautionary tales to scare naughty teenagers: “Look what happened to Bieber today!”; “Did you see Cyrus in that outfit?” Although Watson has put her head above the parapet before, the provocation cited by the hoaxers was the New York speech she gave last Monday promoting the HeForShe campaign and arguing that gender discrimination harms both men and women.
(3) E.ON was the only one brave – or foolhardy – enough to put its head above the parapet and make a formal application to the government.
(4) Speaking of Suárez, he had a rather poor first-half and if Liverpool want something from this he is going to have to poke his head above the parapet.
(5) Click here to watch The Ashton Kutcher-starring biopic of Apple co-founder Steve Jobs has rather dropped off the radar after its premiere at Sundance - but now it's poked its head above the parapet as its August release date nears.
(6) It’s a way of sticking their heads above the parapet.
(7) Another Russian prepared to put his head above the parapet is oligarch Boris Berezovsky.
(8) "If you put your head above the parapet in Britain and you have self-confidence, especially if you're a woman, people don't like it."
(9) Yet the fact remains women who put their head above the parapet have a much harder time than men.
(10) The experience was a window into just how much hatred and rage you can attract simply by being a black woman who raises her head above the parapet in modern Britain.
(11) To the right, two prosecutors in blue uniforms sit at a desk in front of four windows looking on to a brick building with a snowy parapet and a tree petrified in ice.
(12) The passengers are packed so tightly that those on the outside face outwards, with their legs hanging from the parapet.
(13) "Nobody wants to stick their head above the parapet.
(14) Rexy had managed to get lodged so when looking toward the cervix using a speculum you could just see his head and front claws above this anatomical parapet.
(15) Douglas has never put her head above the parapet, sought out or courted the press, and always seems most at ease with other BBC radio people, with producers, and the talent, who, naturally, like her focus on them.
(16) If you find it’s very difficult to change things, and I had a similar problem to Heather when I was on the FA council, you know that if you stick your head over the parapet, someone is going to want to chop it off.
(17) They are being bullied, they are being intimidated, they are being pressurised not to support me, so we don’t have a contest.” He told the Good Morning Scotland programme: “I wouldn’t even have put my head above the parapet if I didn’t know I had that support.” He said problems with the “party machine” were about “people who want power and position and influence”.
(18) But one Harare-based ambassador has stuck his head above the parapet.
(19) In the statement, he said: "The soil we till is highly controversial, and anyone who puts their head above the parapet has to be prepared to endure a degree of public vilification.
(20) From there, he wrote one the earliest “panoramic” portraits of the city seen from an azotea: “ Come Sundays, and the high windows, what with the red light that they reflect, look like entrances to burning furnaces; just when the sun becomes more endurable and drags its horizontal rays across the city, the people of Mexico appear on the rooftops and give themselves to contemplating the streets, to looking up at the sky, to spying on the neighbouring houses, to not doing anything (…) It is then when the bored emerge to the rooftops, men who spend long hours reclined on parapets, looking at a tiny figure that moves around in another rooftop, on the horizon, as far as sight can carry.