Chance is the opposite of Skill. Skill is a synonym of Acquisition. Assumption is a type of Acquisition. 
Knock is a type of Blow. Blow is a synonym of Belt. Belt is related to Leather. 
Chance <--Antonym--> Skill <--Synonym--> Acquisition <--IsA-- Assumption 
Knock --IsA--> Blow <--Synonym--> Belt <--RelatedTo--> Leather 