The best replacement for namespace is class.

The best alternatives to namespace are rated as following:
★★★★★  class
★★  assembly
★★  package
★★  static class
★★  module
★★  targetnamespace
★  using
★  type cannot be found
★  assembly c#
★  scope rails
★  class c++
  target namespace
  static class c++
  include
  package java
  dtd

Your alternative for namespace is not listed? Suggest!
Speaking about namespace, one probably shouldn't forget about class.

Other search terms related to namespace and their ratings are:
★★★★★ class
★★★ xslt
★★★ jaxb
★★★ replication
★★ xpath
★ this name does not exist
You have in mind a companion for namespace and it is not yet here? Propose!



Google Trends

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namespace
class
assembly