Drop is related to Like. Like is the opposite of Opposite. Opposite is similar to Different. 
Tank is a type of Weapon. Tank is related to Fill. Fill is related to Make. 
Drop <--RelatedTo--> Like <--Antonym--> Opposite <--SimilarTo--> Different 
Weapon <--IsA-- Tank <--RelatedTo--> Fill <--RelatedTo--> Make 