Plunge is a synonym of Dip. Dip is related to Sauce. Sauce is related to Tomato. Tomato is related to Soup. 
Doll is related to Basket. Basket is related to Ball. 
Plunge <--Synonym--> Dip <--RelatedTo--> Sauce <--RelatedTo--> Tomato <--RelatedTo--> Soup 
Doll <--RelatedTo--> Basket <--RelatedTo--> Ball 