callus (n.)
- armor
- callosity
- callousness
- cancer
- carcinoma
- corn
- cyst
- excrescence
- fungus
- growth
- hardheartedness
- hardness
- imperviousness
- induration
- insensitiveness
- insensitivity
- intumescence
- mole
- neoplasm
- nevus
- obduracy
- outgrowth
- sarcoma
- tumor
- verruca
- wart
- wen
