Grave is related to Plot. Plot is related to Main. Main is related to Idea. Idea is related to Creative. 
Nut is a type of Tool. Nut is a type of Block. Block is the opposite of Attack. Tackle is a type of Attack. 
Grave <--RelatedTo--> Plot <--RelatedTo--> Main <--RelatedTo--> Idea <--RelatedTo--> Creative 
Tool <--IsA-- Nut --IsA--> Block <--Antonym--> Attack <--IsA-- Tackle 