A word in a web page that, when clicked, opens another document is a

A hyperlink is clickable text or an image that, when selected, opens another document or page.

An anchor is the underlying HTML element that marks the spot, but the clickable connection itself is the hyperlink.

A URL is the address the link points to, not the clickable word on the page.

A reference is a generic pointer and is not the specific web term for a clickable link.

Hyperlinks are the threads that weave separate pages into the interconnected web.

They usually appear underlined and coloured so readers can spot them.