There isn't one single, universally accepted "scientific term" for substance. The word "substance" itself is used frequently in scientific contexts, but it can have slightly different meanings depending on the field.

Here are some ways "substance" is used in science, and the more specific terms that might be used instead:

* Chemistry: In chemistry, "substance" often refers to a pure chemical compound (like water, salt, or glucose). However, it can also be used more broadly to refer to any material, including mixtures.

* Physics: In physics, "substance" can be used in relation to matter or material. It might refer to something's physical composition, density, or its ability to interact with forces.

* Medicine/Pharmacology: "Substance" is frequently used in medicine to refer to drugs or psychoactive compounds.

* General Science: In a broader scientific sense, "substance" can be used to describe anything that has physical properties and can be measured.

Here are some specific terms that might be more accurate depending on the context:

* Matter: Anything that has mass and takes up space.

* Material: A substance that can be used to make something else.

* Chemical compound: A substance formed by the chemical combination of two or more elements in a fixed ratio.

* Mixture: A combination of two or more substances that are not chemically bonded.

* Element: A pure substance that cannot be broken down into simpler substances.

Ultimately, the best term to use depends on the specific context and what you are trying to communicate.