Nuclear is related to Energy. Energy is related to Powerful. Powerful is related to Motor. Motor is related to Car. 
Entrance is a synonym of Hall. Hall is a synonym of Corridor. Hallway is a type of Corridor. 
Nuclear <--RelatedTo--> Energy <--RelatedTo--> Powerful <--RelatedTo--> Motor <--RelatedTo--> Car 
Entrance <--Synonym--> Hall <--Synonym--> Corridor <--IsA-- Hallway 