Jesus Christ, who we know is the Word because of John 1:1-18.
Scripture is the Word in a secondary sense (one should not call it the Word of the Word, because Jesus Christ, the Word, is God, so words about Him or of Him are words of God), because all of it testifies about Him, even the Old Testament* and thus it represents our primary means of accessing His teachings when read and with the One Holy Catholic and Apostolic Church we confess in the creed, however one defines it (most Evangelicals and Fundamentalists either go for an invisible church or a local church ecclesiology, but Anglicans, the largest Protestant denomination, often follow a branch ecclesiology, while Lutherans, except for Pietists, liberals and crypto-Calvinists tend to follow an ecclesiology centered around orthodox worship as defined by Martin Luther, which was a pretty good summary of how traditional churches work, one of the many reasons why I have developed such a good friendship with LCMS and LCC members like
@MarkRohfrietsch).
However all scriptural references I have seen that refer to the Word have a Christological interpretation, especially including John 10:35. But one can apply them to Scripture insofar as Scripture depicts Christ, like an icon, and in Christ God is revealed to us. However, Scripture is not uncreated or a divine person who became incarnate for our salvation.
The problem is that people elevate Scripture to being our supreme authority, when that station resides with Christ - Scripture records His life and works and prophecies of it, and the exposition of His Gospel by the Apostles, as well as eschatological prophecy, but it can be mistranslated, misinterpreted by ecclesiastical authorities and misunderstood by the laity, which is why it should always be read, whether privately or in divine worship, together with the Church (however one defines the Church) rather than apart from it.
This is clearly illustrated by the New Testament’s emphasis on the authority of the Apostolic Tradition in 1 Corinthians 11:6, 2 Thessalonians 2:15 and Galatians 1:8-9, which was recognized by the Sola Scriptura of Luther, Calvin, Cranmer and Wesley, all of whom, even Calvin, paid attention to tradition and Patristics, but not by the Nuda Scriptura approach we see associated with fundamentalism.
*See Luke ch. 24