Historic is related to Ancient. Ancient is the opposite of Young. 
Electricity is related to Spark. Spark is related to Starter. Starter is related to Motor. Motor is related to Boat. 
Historic <--RelatedTo--> Ancient <--Antonym--> Young 
Electricity <--RelatedTo--> Spark <--RelatedTo--> Starter <--RelatedTo--> Motor <--RelatedTo--> Boat 