Butter is a type of Grocery. Butter is related to Oil. Oil is related to Mud. Mud is related to Land. 
Prior is related to Early. Early is similar to Young. Young is related to Master. 
Grocery <--IsA-- Butter <--RelatedTo--> Oil <--RelatedTo--> Mud <--RelatedTo--> Land 
Prior <--RelatedTo--> Early <--SimilarTo--> Young <--RelatedTo--> Master 