Chat room and Web site

Chat room noun - A site on the internet where a number of users can communicate in real time (typically one dedicated to a particular topic).

Web site and chat room are semantically related. In some cases you can use "Web site" instead a noun phrase "Chat room".

Web site noun - A computer connected to the internet that maintains a series of web pages on the World Wide Web.

Chat room and web site are semantically related. Sometimes you can replace phrase "Chat room" with "Web site", this phrases are similar.