Incentive is a type of Encouraging. Encouraging is derived from Encourage. Cheer is a type of Encourage. Cheer is a synonym of Inspire. 
Bubble is a type of Illusion. Illusion is related to Magic. Magic is related to Appear. Appear is a synonym of Known. 
Incentive --IsA--> Encouraging --DerivedFrom--> Encourage <--IsA-- Cheer <--Synonym--> Inspire 
Bubble --IsA--> Illusion <--RelatedTo--> Magic <--RelatedTo--> Appear <--Synonym--> Known 