Best is related to Quality. Power is a type of Quality. 
Treat is a synonym of Use. Use is related to Crop. Crop is the opposite of Expand. Expand is a synonym of Elaborate. 
Best <--RelatedTo--> Quality <--IsA-- Power 
Treat <--Synonym--> Use <--RelatedTo--> Crop <--Antonym--> Expand <--Synonym--> Elaborate 