In addition to the other people you’re hearing, “dwarf planet” also has specific criteria associated with how the body interreacts with its solar system. A dwarf planet has to orbit its star directly and be big enough for its gravity to have pulled it into a roughly spherical shape, but small enough that it hasn’t cleared its orbit.

A dwarf star is just a star that’s not particularly big and bright for whatever reason. While the terminology is similar, the usage is very different.