Organ is related to Music. Music would make you want to Sing. Singer is derived from Sing. 
Toy is related to Colorful. Colorful is similar to Brilliant. Brilliant is a synonym of Wonderful. 
Organ <--RelatedTo--> Music --CausesDesire--> Sing <--DerivedFrom-- Singer 
Toy <--RelatedTo--> Colorful <--SimilarTo--> Brilliant <--Synonym--> Wonderful 