Spark is a synonym of Ghost. Ghost is related to Shadow. 
Incident is related to Battle. Battle is related to Hill. Hill can be Tall. Tall is related to Grow. 
Spark <--Synonym--> Ghost <--RelatedTo--> Shadow 
Incident <--RelatedTo--> Battle <--RelatedTo--> Hill --HasProperty--> Tall <--RelatedTo--> Grow 