Gap is a synonym of Neck. Neck is related to Face. Face is related to Watch. Watch is related to Look. 
Constitution is a type of Property. Property is a type of Object. Charm is a type of Object. 
Gap <--Synonym--> Neck <--RelatedTo--> Face <--RelatedTo--> Watch <--RelatedTo--> Look 
Constitution --IsA--> Property --IsA--> Object <--IsA-- Charm 