Shower is a type of Spray. Shower can be used for Wash. Wash is related to Dirt. 
Mix is a synonym of Compound. Compound is a type of Chemical. Chemical is a different concept from Physical. Physical is related to Matter. 
Spray <--IsA-- Shower --UsedFor--> Wash <--RelatedTo--> Dirt 
Mix <--Synonym--> Compound --IsA--> Chemical <--DistinctFrom--> Physical <--RelatedTo--> Matter 