National is the opposite of Stranger. Stranger is a synonym of Foreigner. 
Material is related to Glass. Glass is related to Lens. you are likely to find Lens in/at/on Telescope. Telescope is related to Astronomer. 
National <--Antonym--> Stranger <--Synonym--> Foreigner 
Material <--RelatedTo--> Glass <--RelatedTo--> Lens --AtLocation--> Telescope <--RelatedTo--> Astronomer 