City is related to Rural. Room is etymologically related to Rural. Room is related to Housing. 
Afternoon is a different concept from Night. Night is the opposite of Birthday. Birthday is related to Put. Put is related to Fill. 
City <--RelatedTo--> Rural <--EtymologicallyRelatedTo-- Room <--RelatedTo--> Housing 
Afternoon <--DistinctFrom--> Night <--Antonym--> Birthday <--RelatedTo--> Put <--RelatedTo--> Fill 