Period is related to Modern. Modern is related to Era. Era is a synonym of Age. 
Fly is a synonym of Vanish. Vanish is a type of End. Dissolve is a type of End. 
Period <--RelatedTo--> Modern <--RelatedTo--> Era <--Synonym--> Age 
Fly <--Synonym--> Vanish --IsA--> End <--IsA-- Dissolve 