In English, "worldwide" is one word. Yet "World Wide Web" was spelled with three words in order to justify the catchy WWW acronym. See World Wide Web.
"Worldwide Web." YourDictionary, n.d. Web. 24 May 2018. <http://www.yourdictionary.com/worldwide-web>.
Worldwide Web. (n.d.). Retrieved May 24th, 2018, from http://www.yourdictionary.com/worldwide-web