Which Administrative order is more severe, a cancellation, or a revoca...

The word “cancellation” has a serious and final connotation to it, which is what makes it a good false answer to such a question. A cancellation order, like a withdrawal order, is not a punitive order.  The Administrator cancels a registration if the registrant dies, is declared mentally incompetent, or cannot be located. The most severe punitive order the Administrator issues is an order of revocation.