Astrophysicists are scientists who study the physical properties and behavior of celestial objects such as planets, stars, galaxies, and other cosmic phenomena. While the word "astrophysicists" is commonly used to describe these scientists, there are other synonyms that can be used interchangeably. These include astrometrist, astronomer, celestial physicist, cosmologist, galactic astrophysicist, planetary astronomer, astrobiologist, astrochemist, astrogeologist, and astroecologist. Each term highlights a specific area of focus within the broad field of astrophysics but ultimately refers to scientists who use physics and astronomy to understand the mysteries of the universe.