Regime is a synonym of Government. Government is related to Protest. Protest is related to Objection. Complaint is a type of Objection. 
Vendor is a synonym of Merchant. Merchant is related to Play. Play is related to Do. Theme is etymologically related to Do. 
Regime <--Synonym--> Government <--RelatedTo--> Protest <--RelatedTo--> Objection <--IsA-- Complaint 
Vendor <--Synonym--> Merchant <--RelatedTo--> Play <--RelatedTo--> Do <--EtymologicallyRelatedTo-- Theme 