Almost everyone in almost all contexts agrees on what matter is, though. I can't think of any conversation about material objects I've ever had where "is this matter?" was ever up for consideration.

Consciousness is almost the opposite. It consists of lots of weird properties, people disagree where it starts and ends, and people very frequently get tricked into thinking things we now obviously believe are not conscious, are. There is not even a working definition, a "local definition" that works for this conversation between us. It's just complete gibberish.