I would propose using "Championship" in the following ways:
Championship Targets: Already defined by PDGA.
Championship Tee Pads: Pretty well defined as roughened concrete at least 5x12, artificial turf (Europe) or rubber mats done well (Maple Hill).
Championship Design: Pertains to the hole designs and routing plus has been evaluated, and ideally tested, to challenge the intended skill level, which doesn't have to be gold. Does not require either Championship baskets and/or tee pads but helps credibility. Can be temporary like USDGC.
Championship Caliber (course): Incorporates all of the elements above. Ideally permanent facility but can be temporary.
Championship Course: Championship Caliber course with amenities suitable for hosting events such as good parking, consistent maintenance, tournament HQ building and pro shop, likely pay to play or at least "pay to get in the park". Ideally permanent facility but can be temporary.
Championship Venue: Site with more than one Championship Course with facilities to handle major events ideally with hi speed internet, good cell reception and eventually sitewide WiFi.