English is related to British. British is related to Minister. Minister is related to Prime. 
Drain is a type of Consume. Consume is the opposite of Produce. Productivity is derived from Produce. 
English <--RelatedTo--> British <--RelatedTo--> Minister <--RelatedTo--> Prime 
Drain --IsA--> Consume <--Antonym--> Produce <--DerivedFrom-- Productivity 