Shell is a synonym of Beat. Beat is related to Fight. Shock is a type of Fight. Shock is related to Intense. 
Smile is related to Laughter. Laughter is related to Play. Play is the opposite of Boring. Boring is the opposite of Interest. 
Shell <--Synonym--> Beat <--RelatedTo--> Fight <--IsA-- Shock <--RelatedTo--> Intense 
Smile <--RelatedTo--> Laughter <--RelatedTo--> Play <--Antonym--> Boring <--Antonym--> Interest 