Worried is a synonym of Anxious. Anxious is the opposite of Easy. Easy is related to Snap. Snap is a type of Sound. 
Lover can Complete. Lover can Kiss. one thing you do when you Kiss is Smile. Smile is a different concept from Laugh. 
Worried <--Synonym--> Anxious <--Antonym--> Easy <--RelatedTo--> Snap --IsA--> Sound 
Complete <--CapableOf-- Lover --CapableOf--> Kiss --HasSubevent--> Smile <--DistinctFrom--> Laugh 