enamel → IsA → the hardest substance | 0.64 | |
enamel → IsA → hard substance | 0.53 | |
enamel → IsA → the strongest substance | 0.40 | |
enamel → IsA → the substance | 0.36 | |
enamel → IsA → hard, protective coating | 0.25 | |
enamel → IsA → porcelain fused glass coating | 0.25 |