Store is related to Ordinary. Ordinary is the opposite of Strange. Strange is the opposite of Familiar. Familiar is similar to Everyday. 
Mass is related to Gathering. Gathering is related to Group. 
Store <--RelatedTo--> Ordinary <--Antonym--> Strange <--Antonym--> Familiar <--SimilarTo--> Everyday 
Mass <--RelatedTo--> Gathering <--RelatedTo--> Group 