Empty is a type of Container. Empty is the opposite of Fill. Fill is related to Action. Action is related to Follow. 
Fighting is related to Army. Army is related to Officer. Officer is related to President. 
Container <--IsA-- Empty <--Antonym--> Fill <--RelatedTo--> Action <--RelatedTo--> Follow 
Fighting <--RelatedTo--> Army <--RelatedTo--> Officer <--RelatedTo--> President 