Invite is related to Invitation. Invitation is related to Come. Come is the opposite of Flee. 
Enforcement is related to Law. Law is related to Legislature. Legislature is etymologically related to Legislator. 
Invite <--RelatedTo--> Invitation <--RelatedTo--> Come <--Antonym--> Flee 
Enforcement <--RelatedTo--> Law <--RelatedTo--> Legislature --EtymologicallyRelatedTo--> Legislator 