Phrasing it

The form website is the most commonly used form, but "Web site" and "web site" are also used. Some academia, some large book publishers, and dictionaries such as Merriam-Webster use "Web site". This is because "Web" is not a generic term, but rather, it is a short form of the proper name World Wide Web. As with many newly-created terms, it may take some time before a common phrasing is finalized. This debate also applies to the related terms such as web page, webmaster, and webcam.
The Reuters style guide uses "website", making no mention of any other spelling.[4]
The Chicago Manual of Style recommends "Web site" for formal use and "website" for informal use [5]
The AP Stylebook from The Associated Press previously[6] used "Web site", but announced in April 2010 it would change to "website"[7].
The Canadian Oxford Dictionary and the Canadian Press Style book lists "website" as the preferred phrase. The Oxford English Dictionary began using "website" as its standardized form in 2004.[8]
Garner's Modern American Usage acknowledges that "website" is the standard form [9].
Bill Walsh, the copy chief of The Washington Post's national desk, argues for using "Web site" in his books, Lapsing into a Comma and The Elephants of Style, and on his website, The Slot.[10] However, the Washington Post itself uses "website". [11]
Among major internet technology companies, Microsoft uses "website" and occasionally "web site" [12][13][14], Apple uses "website" [15], and Google uses "website".[16].