Answer
Volume, resistance, color, shape.
Work Step by Step
If the volume of a gas or liquid changes with temperature, one could exploit that property to make a thermometer.
If the electrical resistivity of a material changes with temperature, one could exploit that property to make a thermometer.
If the peak color of light emitted from a hot object changes with temperature (e.g., it becomes red-hot, then white-hot), one could exploit that property to make a thermometer.
If the shape of an object changes with temperature, one could exploit that property to make a thermometer. (One example is a bimetallic strip, which bends with changes in temperature.)
