Can a substance have properties or both a liquid and solid?

Yes, a substance can exhibit properties of both a liquid and a solid; this is known as a "non-Newtonian fluid" or a "viscoelastic material." For example, materials like cornstarch mixed with water can behave like a solid under stress but flow like a liquid when at rest. Additionally, certain substances, such as slurries or gels, can display characteristics of both states depending on the conditions applied to them, such as pressure or temperature.