Words of Rank rule is an outcome of "ejusdem generic".  According to the rule of words of rank the Statute which deals with persons or thing,  of  inferior rank are not extended to those of superior degree by the introduction of general words.  The general words following particular words will not cover anything of a class superior to those to which the particular words relate.

 Kavita Devi v/s U.O.I (2003) 4 SCC 753, In this case duty imposed on copper, brass, Pewter and Tin .  All other metals not enumerated do not cover silver or Gold as these are metals of a superior kind to the particular metals enumerated.

 See also... 

Fundamental Rights, Nature of Fundamental Rights

Consolidating statute | The Interpretation of Statutes

Types of Statute | Law of Interpretation of Statutes

Golden Rule of Interpretation | Law of Interpretation of Statute


See Also..