Opposition is the opposite of Support. Second is a type of Support. Second is related to Case. Kit is a type of Case. 
you are likely to find Milk in/at/on Refrigerator. you are likely to find Salad in/at/on Refrigerator. Salad is the opposite of Soup. 
Opposition <--Antonym--> Support <--IsA-- Second <--RelatedTo--> Case <--IsA-- Kit 
Milk --AtLocation--> Refrigerator <--AtLocation-- Salad <--Antonym--> Soup 