Fast is related to Run. Run is a type of Enforce. Enforce is a synonym of Impose. 
Loose is a synonym of Shoot. Shut is etymologically related to Shoot. Shut is the opposite of Talk. 
Fast <--RelatedTo--> Run --IsA--> Enforce <--Synonym--> Impose 
Loose <--Synonym--> Shoot <--EtymologicallyRelatedTo-- Shut <--Antonym--> Talk 