Active is a synonym of Practical. Practical is a different concept from Theory. Theory is related to Grand. Grand is related to Great. 
Repair is a type of Improvement. Piece is a type of Repair. Piece is related to Little. Little is related to Description. 
Active <--Synonym--> Practical <--DistinctFrom--> Theory <--RelatedTo--> Grand <--RelatedTo--> Great 
Improvement <--IsA-- Repair <--IsA-- Piece <--RelatedTo--> Little <--RelatedTo--> Description 