Well, now you're simply playing with language, claiming all substantives are substances, when they can be events also.
OK, let us not play games. I asked about definition of matter and you said that "matter is anything that exists in space-time". This is not a definition of matter.
It is a claim that only matter exists in space-time and that no matter exists outside of space-time. But what is matter? And what is space-time?
In ancient times one sophist defined human being as featherless biped. So one guy brought him a plucked chicken and said: "here is your human being".