Radioactive waste and Radioactive material

Radioactive waste noun - Useless radioactive materials that are left after some laboratory or commercial process is completed.

Radioactive material and radioactive waste are semantically related. In some cases you can use "Radioactive material" instead a noun phrase "Radioactive waste".

Radioactive material noun - Material that is radioactive.

Radioactive waste and radioactive material are semantically related. Sometimes you can replace phrase "Radioactive waste" with "Radioactive material", this phrases are similar.