Terrain is related to Slope. Slope is related to Run. Run is a synonym of Extend. 
Slide is related to Structure. Structure is related to Architecture. Architecture is related to Design. 
Terrain <--RelatedTo--> Slope <--RelatedTo--> Run <--Synonym--> Extend 
Slide <--RelatedTo--> Structure <--RelatedTo--> Architecture <--RelatedTo--> Design 