Spray is related to Do. Do is the opposite of Repeat. Repeat is related to Ongoing. Ongoing is related to Continue. 
Sort is a synonym of Class. Class is related to Student. 
Spray <--RelatedTo--> Do <--Antonym--> Repeat <--RelatedTo--> Ongoing <--RelatedTo--> Continue 
Sort <--Synonym--> Class <--RelatedTo--> Student 