The best replacement for include is includes.

The best alternatives to include are rated as following:
★★★★★  includes
★★★★  require
★★★  include_once
★★  extend
★★  import
★  require_once
★  require php
★  input latex
★  comprise
★  require ruby
★  contain
★  extend use case
★  include once
★  exclude
★  require_once php
★  import xsd
★  including
★  extend sass
  which includes
  forward declaration
  require in php
  require puppet
  join linq
  import jsp
  forward
  dynamic include
  include directive
  import c++
  include
  iframe
  incorporate
  require once
  input
  xsl import
  extend ruby
  file_get_contents
  these includes
  not to include

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Speaking about include, one probably shouldn't forget about parameters php.

Other search terms related to include and their ratings are:
★★★★★ parameters php
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include
includes
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