Cross is a type of Fold. Fold is a synonym of Close. 
Smile is related to Laughter. Laughter is related to Play. Play is the opposite of Boring. Boring is the opposite of Interest. 
Cross --IsA--> Fold <--Synonym--> Close 
Smile <--RelatedTo--> Laughter <--RelatedTo--> Play <--Antonym--> Boring <--Antonym--> Interest 