Incredible is a synonym of Wonderful. Wonderful is a synonym of Fantastic. Fantastic is related to Excellent. 
Understand is etymologically related to Stand. Stand is related to Rise. Rocket is a type of Rise. 
Incredible <--Synonym--> Wonderful <--Synonym--> Fantastic <--RelatedTo--> Excellent 
Understand --EtymologicallyRelatedTo--> Stand <--RelatedTo--> Rise <--IsA-- Rocket 