command button

Don't use in content for a general audience. Most of the time, just refer to the button by its UI label. In content that teaches beginning skills, use the label followed by the word button.

Examples
For information about the dialog box, select the Help button.
For information about the dialog box, select Help.

It's OK to use command button in content for developers about creating command buttons.

Don't refer to a command button as an action button or push button.

See also Describing interactions with UI, Formatting text in instructions