The term "interstellar spaces" refers to the vast areas of space between stars. There are several synonyms that can be used to describe these regions, including interstellar voids, interstellar regions, and interstellar vacuums. The term "interstellar voids" emphasizes the emptiness of this space, while "interstellar regions" suggests that these spaces may contain matter such as gas and dust. "Interstellar vacuums" also highlights the absence of matter in these areas. Other synonyms for interstellar spaces include extragalactic spaces, intergalactic spaces, and interplanetary spaces, which all indicate spaces between different types of celestial bodies, such as galaxies or planets.