Agricultural is related to Farm. Farm is related to Corn. Corn is related to Seed. Seed is the opposite of Full. 
Execution is a type of Enforcement. Execution is a synonym of Murder. Murder can be Illegal. 
Agricultural <--RelatedTo--> Farm <--RelatedTo--> Corn <--RelatedTo--> Seed <--Antonym--> Full 
Enforcement <--IsA-- Execution <--Synonym--> Murder --HasProperty--> Illegal 