I did read what you wrote. If you had read the Wikipedia article you would know that
1) The evidence that dark matter is actually a new physical thing is overwhelming.
2) The evidence is not only "interactions between galaxies".
3) The theory does not allow for other causes of the interaction.
4) Everyone that works with it does use the name dark matter for the proposed particles (such as WIMPs, axions, or sterile neutrinos).