you are likely to find Nurse in/at/on Clinic. Nurse is related to Health. Health is related to Fit. 
Space is the opposite of Oxygen. Breathing can be used for Oxygen. Sky can be used for Breathing. 
Clinic <--AtLocation-- Nurse <--RelatedTo--> Health <--RelatedTo--> Fit 
Space <--Antonym--> Oxygen <--UsedFor-- Breathing <--UsedFor-- Sky 