Representation is a synonym of Account. Account is a type of Importance. Importance is a synonym of Significance. 
Living is related to Fish. Rail is a type of Fish. Regulate is etymologically related to Rail. 
Representation <--Synonym--> Account --IsA--> Importance <--Synonym--> Significance 
Living <--RelatedTo--> Fish <--IsA-- Rail <--EtymologicallyRelatedTo-- Regulate 