Magnitude is a type of Importance. Importance is related to Matter. Matter is related to Oil. 
Intelligence is related to Smart. Smart is the opposite of Intelligent. Intelligent is similar to Rational. Rational is related to Logical. 
Magnitude --IsA--> Importance <--RelatedTo--> Matter <--RelatedTo--> Oil 
Intelligence <--RelatedTo--> Smart <--Antonym--> Intelligent <--SimilarTo--> Rational <--RelatedTo--> Logical 