Is antedates a noun

The Word antedates is both a noun and a verb.

The noun antedate (antedates) is a date assigned to an event or document earlier than the actual date of the event or document.

The verb antedate (antedates, antedating, antedated) is to date as of a time prior to that of execution; to assign to a date prior to that of actual occurrence; to precede in time.