Walk is a type of Play. Walk is the opposite of Standing. Importance is a type of Standing. 
Great is the opposite of Horrible. Horrible is related to Bad. Bad is related to Bone. Jaw is a type of Bone. 
Play <--IsA-- Walk <--Antonym--> Standing <--IsA-- Importance 
Great <--Antonym--> Horrible <--RelatedTo--> Bad <--RelatedTo--> Bone <--IsA-- Jaw 