Complete is the opposite of Piece. Piece is related to Chunk. Chunk is a synonym of Ball. Ball is related to Beach. 
Tax is related to Program. Program is a type of Software. 
Complete <--Antonym--> Piece <--RelatedTo--> Chunk <--Synonym--> Ball <--RelatedTo--> Beach 
Tax <--RelatedTo--> Program --IsA--> Software 