/usr/share/postgresql/9.4/tsearch_data/synonym_sample.syn is in postgresql-9.4 9.4.18-0+deb8u1.
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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