Pass is a synonym of Better. Better is related to Quality. Credibility is a type of Quality. 
Cluster is a synonym of Crowd. Crowd is related to Show. you are likely to find Curtain in/at/on Show. 
Pass <--Synonym--> Better <--RelatedTo--> Quality <--IsA-- Credibility 
Cluster <--Synonym--> Crowd <--RelatedTo--> Show <--AtLocation-- Curtain 