この質問とあなたの以前の質問に基づいて、私はあなたがこのようなものを探しているかもしれないと思います:
SELECT u.name_surname,
u.avatar,
GROUP_CONCAT(DISTINCT w.word Order by w.word asc) AS words
FROM users u
INNER JOIN
(
SELECT f1.asker_user_id AS friend_id
FROM friends AS f1
LEFT JOIN friends AS f2
ON f1.asked_user_id = f2.asker_user_id
AND f1.asker_user_id = f2.asked_user_id
WHERE f1.status = 1 AND f2.status IS NULL
AND f1.asked_user_id = 2
) a ON a.friend_id = u.id
LEFT JOIN connections c ON u.id = c.user_id
LEFT JOIN words_en w ON w.id = c.word_id
GROUP BY u.id;