Medical is related to Stroke. Stroke is a synonym of Throw. Throw is a synonym of Confuse. Confuse is a synonym of Disturb. 
Mass is related to Weight. Weight is related to Quiet. 
Medical <--RelatedTo--> Stroke <--Synonym--> Throw <--Synonym--> Confuse <--Synonym--> Disturb 
Mass <--RelatedTo--> Weight <--RelatedTo--> Quiet 