As per your request, here are some of my suggestions to change from Monograph to Sermon. These are based on my understanding of what these types are, but you all may have different criteria.
Sermons:
MacDonald, George. Unspoken Sermons, Second Series. London: Longmans, Green, and Co., 1885.
Fant, Clyde E., Jr., and William M. Pinson Jr. A Treasury of Great Preaching. Vols 1-12. Dallas: Word Publishing, 1995.
Piper, John. Take Care How You Listen: Sermons by John Piper on Receiving the Word. Minneapolis, MN: Desiring God, 2012.
Spurgeon, Charles H. Spurgeon’s Sermons. Electronic ed. Albany, OR: Ages Software, 1998. 63 Volumes
Calvin, John. A Selection of the Most Celebrated Sermons of John Calvin. New York: S. & D. A. Forbes, 1830.
Lloyd-Jones, David Martyn. Revival. Westchester, IL: Crossway Books, 1987.
Nichols, James. Puritan Sermons. Vol. 6. Wheaton, IL: Richard Owen Roberts, Publishers, 1981.
George, Christian T., and Spurgeon’s College. The Lost Sermons of C. H. Spurgeon Volume I: His Earliest Outlines and Sermons between 1851 and 1854. Nashville, TN: B&H, 2017.
Vos, Geerhardus. Grace and Glory: Sermons Preached in the Chapel of Princeton Theological Seminary. Grand Rapids, MI: The Reformed Press, 1922.