*A philosophical outlook that contends that physical matter is the only reality or category of existence, so that everything that exists is a manifestation of the material (rather than a manifestation of the mind). In more popular parlance, the term refers to pursuit of money and possessions as a central goal of human existence. See also monism.
*Stanley J. Grenz, David Guretzki &, Cherith Fee Nordling, Pocket Dictionary of Theological Terms (Downers Grove, IL: InterVarsity Press, 1999), p. 76
Monism is the view that there is only one basic and fundamental reality, and that all existence is this one reality even though we discern different aspects of this reality. It is the idea that all that exists is of one substance.
“Monergism” is the teaching that God alone is the one who saves. It is opposed to “synergism” that teaches God and man work together in salvation. A good example is Cults are synergistic. Christianity is monergistic.
All sound very similar with quite different definitions.