Using two different names for the same concept is confusing and "matter" and "energy" both refer to the same concept and "space" and "time" refer to the same concept. Matter is just concentrated energy and what space is to one observer, time is to another observer. Regarding matter and energy as two separate things and space and time as two separate things seems to cause problems. We need just one word in both cases and do away with the words "matter", "energy", "space", and "time".
I don't know whether it's possible or not but I feel it would help remove some of the strangeness of quantum mechanics and relativity. Physicists do much of their work using a system of units called quantum-gravity units (or Planck units). This is a system of units in which h-bar (h/2pi), G, and c are set to unity. Where h is Planck's constant, G is the universal gravitational constant, and c is the speed of light. However, even in this system of units, mass and energy are still treated as separate entities as are space and time. After converting to this system of units, it's only a matter (no pun intended) of inserting a factor of c or c squared here and there to convert everything to "mattergy" and "spime".
So far, Einstein seems to be almost the only one who has really accepted the equivalence of mass and energy and the equivalence of space and time. No one else can seem to get rid of the old idea of separate entities. Our universe is really just spime filled with mattergy!
Now I can't say I put a lot of time and effort into composing this small article. I'll have to say I put a lot of spime and mattergy into composing it.