Severe is related to Disease. Disease is related to Cancer. Tumor is a type of Cancer. 
Scared is related to Horror. Horror is related to Stuff. Stuff is related to Sugar. Sugar is related to Empty. 
Severe <--RelatedTo--> Disease <--RelatedTo--> Cancer <--IsA-- Tumor 
Scared <--RelatedTo--> Horror <--RelatedTo--> Stuff <--RelatedTo--> Sugar <--RelatedTo--> Empty 