Wall is the opposite of Window. Window is related to Class. Class is related to Being. 
Moon can be used for Observation. Moon is related to Plate. Plate is related to Device. Telescope is a type of Device. 
Wall <--Antonym--> Window <--RelatedTo--> Class <--RelatedTo--> Being 
Observation <--UsedFor-- Moon <--RelatedTo--> Plate <--RelatedTo--> Device <--IsA-- Telescope 