Postgres table column name restrictions?

Here's a nice table of reserved words in PostgreSQL:
http://www.postgresql.org/docs/current/static/sql-keywords-appendix.html

It is probably best to simply avoid using those words as table- or column-names.
An alternative, however, is to enclose the identifier in double-quotes, e.g.:

CREATE TABLE IF NOT EXISTS apiss (
    skey TEXT, 
    time INTEGER, 
    "user" TEXT, 
    ip TEXT);

Additionally, Postgres reserves system column names for internal use in every table: "Every table has several system columns that are implicitly defined by the system. Therefore, these names cannot be used as names of user-defined columns."

https://www.postgresql.org/docs/current/ddl-system-columns.html

In my company, I had to scan an entire database for reserved words. I solved the task with the help of

select * from pg_get_keywords()