The best replacement for summons is subpoena.

The best alternatives to summons are rated as following:
★★★★★  subpoena
★★★★  ticket
★★★  warrant
★★★  citation
★★  arrest
★★  complaint
★★  statement of claim
★★  summonses
★  supeana
★  writ
  subpoena difference
  information and summons
  court order
  appearance notice
  magistrate summons
  alias summons
  originating summons
  sopena
  warrant nj
  subpoenas
  arrested

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Speaking about summons, one probably shouldn't forget about notice.

Other search terms related to summons and their ratings are:
★★★★★ notice
★★ endorsed complaint
★★ complaint
original complaint
being served
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Google Trends

Scale is based on the average worldwide traffic of summons in all years. Click on graph for more.
summons
subpoena
ticket