You probably won't like this answer, but it doesn't matter here: REST does not use endpoint terminology at all. You can check the Fielding theses yourself: http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm - open the PDF file and find the "endpoint".
Fumanchu's answer is probably closest to you: "/ Users" is a relative path and can be used as Request-URI in the query string according to the HTTP specification 2616.
In the web API documentation, I would probably call "/ Users" the "Endpoint" link like you would, and "GET / Users" would be "Operation". Perhaps you can get inspiration here: https://nhs.3scale.net/docs
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