Re: RETURNS TABLE function: ERROR: column reference "word" is ambiguous

CREATE OR REPLACE FUNCTION words_check_words(

        IN in_uid integer,

        IN in_gid integer,

        IN in_tiles jsonb)

        RETURNS TABLE(word varchar, score integer) AS

$func$

        CREATE TEMPORARY TABLE _words (word varchar, score integer) ON COMMIT DROP;

        FOR _tile IN SELECT * FROM JSONB_ARRAY_ELEMENTS(in_tiles)

        LOOP

              .....

                IF LENGTH(_word) > 1 /* AND EXISTS SELECT 1 FROM words_nouns */ THEN

                        INSERT INTO _words(word, score)

                        VALUES (upper(_word), _score);

                END IF;

        END LOOP;

        RETURN QUERY

        SELECT w.word, max(w.score) as score 

        FROM _words w 

        GROUP BY w.word;

END

$func$ LANGUAGE plpgsql;