Homonym: phase (Stage)
A "phase" refers to a distinct stage in a process or development. It can describe changes in various contexts, such as the phases of the moon, which include new moon, first quarter, full moon, and last quarter. Each phase represents a different appearance and position of the moon relative to the Earth and the sun.
In science, phases can also refer to states of matter, such as solid, liquid, and gas. Each phase has unique properties and behaviors. For example, water can exist in different phases depending on temperature and pressure, transitioning between ice, liquid water, and steam.