diktat

As nouns the difference between diktat and command

is that diktat is a harsh penalty or settlement imposed upon a defeated party by the victor while command is an order to do something.

As a verb command is

to order, give orders; to compel or direct with authority.

As nouns the difference between diktat and edict

is that diktat is a harsh penalty or settlement imposed upon a defeated party by the victor while edict is a proclamation of law or other authoritative command.

As nouns the difference between order and diktat

is that order is arrangement, disposition, sequence while diktat is a harsh penalty or settlement imposed upon a defeated party by the victor.

As a verb order

is to set in some sort of order.