We should have more specific definition for title, description, and help.

On Windows there are: UIA_NamePropertyId, UIA_LocalizedControlTypePropertyId, UIA_HelpTextPropertyId
On Mac: AXTitle (or AXValue), AXDescription, AXRoleDescription, AXHelp.
AXDescription is defined as:
"The purpose of the element, not including the role, described in a way that is slightly more specific than the value of the AXRoleDescription attribute, but shorter than value of the AXHelp attribute. Often used to describe images or buttons with images and no title. A description is usually short and uses neither capitalization nor punctuation."
Testing showed that setting AXDescription basically replaces AXTitle.

On JavaFX there is
TITLE - AXTitle on Mac and UIA_NamePropertyId on Windows
DESCRIPTION - AXDescription on Mac and nothing on Windows.
TOOLTIP - AXHelp on Mac and UIA_HelpTextPropertyId on Windows.

I believe we should have:
TITLE - AXTitle on Mac and UIA_NamePropertyId on Windows (unchanged)
DESCRIPTION - AXRoleDescription on Mac and UIA_LocalizedControlTypePropertyId on Windows.
HELP - AXHelp on Mac and UIA_HelpTextPropertyId on Windows.

Note on HELP: If the Node does not answer HELP but it has a tooltip, then the textual content of the tooltip can be used as help.