There isn't really a single "other word" for physics. It's a very specific term, and other words would describe related concepts, but not the same thing.

Here are some examples of what you might be looking for, depending on the context:

* Natural philosophy: This is a historical term for what we now call physics. It was used before the distinction between physics and other natural sciences was established.

* Physical science: This is a broader term that encompasses physics, chemistry, astronomy, and other fields that study the natural world.

* Natural science: An even broader term than "physical science" that includes biology and geology as well.

* Cosmology: This is a branch of physics that studies the universe as a whole.

* Mechanics: This is a branch of physics that studies the motion of objects.

* Astrophysics: This is a branch of physics that studies celestial objects and phenomena.

Could you provide more context about what you're looking for? That might help me give a more specific answer!