Confuse is a synonym of Throw. 
Crowd is the opposite of Person. Person is related to Citizen. Citizen is the opposite of Stranger. you are likely to find Stranger in/at/on Store. 
Confuse <--Synonym--> Throw 
Crowd <--Antonym--> Person <--RelatedTo--> Citizen <--Antonym--> Stranger --AtLocation--> Store 