Shadow can be used for Shade. Shade is related to Shape. Shape is related to Star. Star is related to Wish. 
Cost is etymologically related to Choose. Cost is related to Quality. Qualify is derived from Quality. Qualify is a synonym of Characterize. 
Shadow --UsedFor--> Shade <--RelatedTo--> Shape <--RelatedTo--> Star <--RelatedTo--> Wish 
Choose <--EtymologicallyRelatedTo-- Cost <--RelatedTo--> Quality <--DerivedFrom-- Qualify <--Synonym--> Characterize 