Verses with the word hymns in the New Testament (2 verses):

Ephesians 5:19
Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord;

Colossians 3:16
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.