1. Plural of hardcore; the most committed or dedicated members of a group, movement, or fan base.
Usage: informal; often used to describe loyal supporters or enthusiasts
2. Plural of hardcore; broken stone or gravel used as a foundation layer in construction.
Usage: technical; construction and civil engineering term

Examples

• The hardcores of the band's fanbase have followed them for over twenty years.
• Only the hardcores showed up to the midnight release event.
• The construction crew laid down several inches of hardcores before pouring the concrete foundation.
• Video game hardcores often compete in professional tournaments.
• The political movement's hardcores remained committed despite setbacks.
• Hardcores of the music genre reject mainstream commercialization.