World is related to Fantasy. Fantasy is related to Creature. 
Fool is a synonym of Bug. Bug is related to Insect. Butterfly is a type of Insect. Butterfly is related to Pretty. 
World <--RelatedTo--> Fantasy <--RelatedTo--> Creature 
Fool <--Synonym--> Bug <--RelatedTo--> Insect <--IsA-- Butterfly <--RelatedTo--> Pretty 