In the specification, "Geospatial data resource" is used for "Geodata tilests" and "Collections Selection" where it is synonymous with an OGC API - Common - Part 2 "collection".
It never means a "map" or "coverage", which is covered by the "geospatial aspect" term (access mechanism).
A "coverage tile" is not a "map tile" in the specification, created a separate term and definition for "coverage tile".
Clarified "tile set scheme" vs. "tile scheme" vs. "tiling scheme"