Group is related to Cast. Cast is the opposite of Crew. Crew is a synonym of Lot. 
Test is related to Experiment. Experiment is related to Control. Control is a synonym of Contain. 
Group <--RelatedTo--> Cast <--Antonym--> Crew <--Synonym--> Lot 
Test <--RelatedTo--> Experiment <--RelatedTo--> Control <--Synonym--> Contain 