If you enter "Address" as the Title property for a content control, Word also assigns "Address" to the Tag property.

Tag

A keyword or term assigned to a piece of information (like a blog post, picture, or video) that helps describe an item and allows it to be found again by browsing or searching.

Title Property

An attribute in software development that specifies the title or name of a window, document, or web page, often displayed in the title bar or header.

Content Control

A feature in document editing software that allows for the inclusion of specific content types, such as date pickers or drop-down lists, within a document.