a column definition list is required for functions returning "record"

Good afternon,

in 9.5.3 I have defined the following custom function:

CREATE OR REPLACE FUNCTION words_select_games(IN in_uid integer)
RETURNS SETOF RECORD AS
$func$
BEGIN
RETURN QUERY SELECT
g.gid AS gid,
EXTRACT(EPOCH FROM g.created)::int AS created,
g.player1 AS player1,
COALESCE(g.player2, 0) AS player2,
COALESCE(EXTRACT(EPOCH FROM g.played1)::int, 0) AS played1,
COALESCE(EXTRACT(EPOCH FROM g.played2)::int, 0) AS played2,
ARRAY_TO_STRING(g.hand1, '') AS hand1,
REGEXP_REPLACE(ARRAY_TO_STRING(g.hand2, ''), '.', '?', 'g')
AS hand2,
g.letters AS letters, /* is a varchar[15][15] */
g.values AS values, /* is an integer[15][15] */
g.bid AS bid,
m.tiles AS last_tiles,
m.score AS last_score
FROM words_games g LEFT JOIN words_moves m USING(mid)
WHERE g.player1 = in_uid
UNION SELECT
g.gid AS gid,
EXTRACT(EPOCH FROM g.created)::int AS created,
g.player2 AS player1,
COALESCE(g.player2, 0) AS player1,
COALESCE(EXTRACT(EPOCH FROM g.played2)::int, 0) AS played1,
COALESCE(EXTRACT(EPOCH FROM g.played1)::int, 0) AS played2,
ARRAY_TO_STRING(g.hand2, '') AS hand1,
REGEXP_REPLACE(ARRAY_TO_STRING(g.hand1, ''), '.', '?', 'g')
AS hand2,
g.letters AS letters,
g.values AS values,
g.bid AS bid,
m.tiles AS last_tiles,
m.score AS last_score
FROM words_games g LEFT JOIN words_moves m USING(mid)
WHERE g.player2 = in_uid;
END
$func$ LANGUAGE plpgsql;

but calling it gives me errors:

words=> select * from words_select_games(1);
ERROR: a column definition list is required for functions returning
"record"
LINE 1: select * from words_select_games(1);
^
words=> select gid, bid from words_select_games(1);

ERROR: a column definition list is required for
functions returning "record"
LINE 1: select gid, bid from words_select_games(1);
^

I have also unsuccessfully tried

RETURNS SETOF words_games, words_moves AS

and without the comma:

RETURNS SETOF words_games words_moves AS

How would you recommend to fix my declaration problem please?

Regards
Alex