Disability is a synonym of Weakness. Weakness is derived from Weak. Weak is a synonym of Slight. Slight is the opposite of Radical. 
Pole is a type of European. Pole is the opposite of Root. Root is related to Science. Science is related to Course. 
Disability <--Synonym--> Weakness --DerivedFrom--> Weak <--Synonym--> Slight <--Antonym--> Radical 
European <--IsA-- Pole <--Antonym--> Root <--RelatedTo--> Science <--RelatedTo--> Course 