Trait is related to Habit. Habit is a synonym of Use. 
Piano is related to Music. Music is the opposite of Secular. Secular is the opposite of Holy. Holy is related to Cross. 
Trait <--RelatedTo--> Habit <--Synonym--> Use 
Piano <--RelatedTo--> Music <--Antonym--> Secular <--Antonym--> Holy <--RelatedTo--> Cross 