Can a 8 lug universal fit a 6 lug and what dose universal mean?

A 8-lug wheel cannot fit a 6-lug vehicle because the number of lugs and their spacing must match for proper installation. "Universal" typically refers to parts that are designed to fit a variety of applications, but in the case of lug patterns, it means that the specific configuration must be compatible with the vehicle's specifications. Thus, a universal fit wheel must accommodate the same number of lugs and their spacing.