Gun is a synonym of Rush. Rush is related to Running. Stadium can be used for Running. you are likely to find Player in/at/on Stadium. 
Familiar is the opposite of New. New is related to Enter. 
Gun <--Synonym--> Rush <--RelatedTo--> Running <--UsedFor-- Stadium <--AtLocation-- Player 
Familiar <--Antonym--> New <--RelatedTo--> Enter 