barney has a scar on his ear
myocardial_scar is tangible_thing. myocardial_scar is not scar. barney_oldfield is person. barney_oldfield is not person. myocardial_scar is scar. barney is costume_of_purple_dinosaur. scar is disease. barney is not costume_of_purple_dinosaur. scar is symptom. callus is scar.