Farm is the opposite of Apartment. Apartment can be used for Enter. Enter is related to Arrive. Arrive is related to Airport. 
Hard is related to Habit. Habit is related to Outfit. Outfit is a synonym of Equip. 
Farm <--Antonym--> Apartment --UsedFor--> Enter <--RelatedTo--> Arrive <--RelatedTo--> Airport 
Hard <--RelatedTo--> Habit <--RelatedTo--> Outfit <--Synonym--> Equip 