The words - The doctrines. Christ often represented himself as instructed and sent to teach certain great truths to men. Those he taught, and no others. See the notes at John 5:30.
Related Commentaries of John 17:8
John 17:8
8 For I have given unto them the words which thou gavest me; and they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me.