Democrat is the opposite of Republic. Republic is related to System. System is a synonym of Composition. 
Define is related to Explain. Explain is related to Description. Description is related to Usual. Usual is related to Ordinary. 
Democrat <--Antonym--> Republic <--RelatedTo--> System <--Synonym--> Composition 
Define <--RelatedTo--> Explain <--RelatedTo--> Description <--RelatedTo--> Usual <--RelatedTo--> Ordinary 