Substantialism, a philosophical concept that emphasizes the importance of physical objects, has some synonyms that closely relate to its meaning. One of the nearest words that could be related to substantialism is materialism, which is also about material or physical objects and their significance in the world. Additionally, empiricism, pragmatism, and realism are some of the philosophical concepts that could be synonyms for substantialism. Empiricism is about basing knowledge on sensory perception and experience. Pragmatism is about the practical application of ideas in achieving a desired outcome, while realism advocates for the objective existence of objects in the physical world. These concepts' philosophical basis complements the meaning of substantialism and, thus, could be used as its synonyms.