There are a multitude of synonyms for the word "physicochemical", many of which convey a similar meaning or describe a related field of study. Some possible synonyms include biophysical, chemical-physical, physical-chemistry, physiochemical, and chemical-physical. Other options may include terms like molecular biophysics, biophysical chemistry, or materials physics. While each of these terms may emphasize a slightly different aspect of the broader discipline of physicochemistry, they all share a focus on the intersection between physical and chemical principles and their impact on matter and energy. By using these synonyms in your writing, you can add nuance and precision to your descriptions of scientific concepts and phenomena.