As a writer/author (among other things) it's always been very important to me to use and preserve accuracy, both historical and according to definition. This is why I always use the term "flying bridge, not "flybridge." I read up on the origin and use of the term many years ago for some project or other, and this structure on a vessel was called a flying bridge because that's exactly what it was, and to a degree, still is.
Common language use does evolve, of course, so it's easy to see how the term became "corrupted" to flybridge, if for no other reason than it's easier to say.
"Rope" and "line" get used incorrectly a lot. Rope is the material, a line is an object that can be made using rope. The term, "rope rode" is correct, for example.
My most recently published book came out just the other week. It's the story of the Clise family and the property development company they founded the day after Seattle burned down in 1889. Both the family and their business continue to be a huge part of the reason Seattle has become the city it is today.
Just as one example-- which blew me away when I learned about and then saw it in person-- anyone in the northwest quadrant of the United States reading this forum right now would not be able to access it-- or any other site on the web-- were it not for what goes on in a set of three high-rise buildings in the middle of downtown Seattle. Called an "internet hotel," it is one of only three such facilities in the country, and they are where all this nation's connectivity takes place. The one in Seattle is owned and operated by the Clise family.
The Clise book was a fascinating project because the story is so intertwined with the history of the city and this region. (As another example, anyone with a child who's benefited from Children's Hospital has Anna Clise to thank; she created and founded Chidren's after she lost one of her own children and decided to do something about the almost total lack of children's health care capabilities in Seattle).
I've written several published books, but this one is the first I've written with two screens in front of me; one with the manuscript itself and the other with Google opened on it.
The Internet has a huge amount of total rubbish on it, but for a writer it's a fabulous source of information with regards to history and facts. For example, for the book I've been working on in my spare time for a number of years now, I needed to know the price of gasoline in Fall River, Massachusetts in the fall of 1942. Turns out there are tables of fuel prices scanned into websites that contain not only that exact information, but also explain the whole reason behind gas rationing during WWII, which as it turns out, had nothing whatsoever to do with gas.
I find it a fascinating way to work because one learns a huge amount about a whole lot of things. Among them, that it's a flying bridge, not a flybridge, and that it's a saloon, not a salon.