LAW:- The system of rules which a country/community recognizes as regulating the action of its members and which it may enforce by the imposition of penalties , i.e.He was arrested for the breaking of law.
ORDER:- An authoritative direction or instruction, command and it is mandatory.
ACT:- That which is done or doing,the exercise of power, or the effect, of which power exerted is the case, a performance,a deed.