/usr/share/postgresql/9.5/tsearch_data/synonym_sample.syn is in postgresql-9.5 9.5.14-0ubuntu0.16.04.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | postgres pgsql
postgresql pgsql
postgre pgsql
gogle googl
indices index*
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