Part is related to Piece. Piece is related to Single. Single is related to Coin. Head is part of Coin. 
Curiosity is a synonym of Wonder. Wonder is related to Surprise. Surprise is related to Delight. Delight is related to Emotion. 
Part <--RelatedTo--> Piece <--RelatedTo--> Single <--RelatedTo--> Coin <--PartOf-- Head 
Curiosity <--Synonym--> Wonder <--RelatedTo--> Surprise <--RelatedTo--> Delight <--RelatedTo--> Emotion 