Worship Elements: Preaching: Word or Gospel? (2 Timothy 4:1-5)

We have been considering at the language of the Belgic Confession that identifies the preaching of the Gospel as a mark of the true church.  If the reformers claim that a mark of the church the the preaching of the gospel then why does Paul exhort Timothy to preach the word?  Does our confession need to be rewritten?  Does Paul understand the preaching of the word to be the preaching of the Gospel?