Spark is related to Bright. Bright is related to Brilliant. Brilliant is related to Very. Very is related to Kill. 
Exciting is related to Interesting. Interesting is the opposite of Boring. Boring is the opposite of Interest. 
Spark <--RelatedTo--> Bright <--RelatedTo--> Brilliant <--RelatedTo--> Very <--RelatedTo--> Kill 
Exciting <--RelatedTo--> Interesting <--Antonym--> Boring <--Antonym--> Interest 