Imply is a synonym of Hint. Hint is related to Color. Color is a type of Change. 
Historic is a synonym of Historical. Historical is the opposite of Contemporary. Contemporary is related to Current. Current is related to Force. 
Imply <--Synonym--> Hint <--RelatedTo--> Color --IsA--> Change 
Historic <--Synonym--> Historical <--Antonym--> Contemporary <--RelatedTo--> Current <--RelatedTo--> Force 