Seal is a synonym of Block. Block is related to Oil. Oil is related to Essence. Essence is a synonym of Sum. 
Handle is a synonym of Cover. Cover is a synonym of Treat. Manipulate is a type of Treat. 
Seal <--Synonym--> Block <--RelatedTo--> Oil <--RelatedTo--> Essence <--Synonym--> Sum 
Handle <--Synonym--> Cover <--Synonym--> Treat <--IsA-- Manipulate 