Muslim is related to Islam. Islam is a type of Civilization. Civilization is related to History. History is related to Social. 
Plain is the opposite of Exotic. Exotic is a synonym of Ethnic. Ethnic is related to Race. Race is related to Competitive. 
Muslim <--RelatedTo--> Islam --IsA--> Civilization <--RelatedTo--> History <--RelatedTo--> Social 
Plain <--Antonym--> Exotic <--Synonym--> Ethnic <--RelatedTo--> Race <--RelatedTo--> Competitive 