If you want to ackshually, both fiber and copper are empty pipes that can carry any layer 2 protocol, and are not inherently Ethernet. They only become Ethernet cables when they're connected to terminals that pass that protocol through them.

Unless we're defining some networking standard, "Ethernet cable" is a perfectly acceptable term. Everyone will understand what is meant. The added specificity you're asking for doesn't improve the quality of communication.

Excuse me, I believe you mean GNU/copper/RJ45/base-T

Thank you.