Scratch is a type of Rival. Rival is a synonym of Competition. Competition is the opposite of Cooperation. 
Astronomer is related to Telescope. Telescope is related to Glass. Glass is related to Sand. you are likely to find Sand in/at/on Concrete. 
Scratch --IsA--> Rival <--Synonym--> Competition <--Antonym--> Cooperation 
Astronomer <--RelatedTo--> Telescope <--RelatedTo--> Glass <--RelatedTo--> Sand --AtLocation--> Concrete 