Decline is a synonym of Decrease. Decrease is the opposite of Raise. Raise is a synonym of Enhance. Enhance is a type of Better. 
Courage is related to Lion. Lion is related to African. African is a type of Person. Goat is a type of Person. 
Decline <--Synonym--> Decrease <--Antonym--> Raise <--Synonym--> Enhance --IsA--> Better 
Courage <--RelatedTo--> Lion <--RelatedTo--> African --IsA--> Person <--IsA-- Goat 