Plain is the opposite of Elaborate. Elaborate is a type of Develop. Develop is related to Invent. 
Great is the opposite of Ordinary. Ordinary is a synonym of Bishop. Bishop is related to Funny. Funny is related to Nest. 
Plain <--Antonym--> Elaborate --IsA--> Develop <--RelatedTo--> Invent 
Great <--Antonym--> Ordinary <--Synonym--> Bishop <--RelatedTo--> Funny <--RelatedTo--> Nest 