Smooth is a type of Album. Album can be used for Music. Music is related to Pleasant. Pleasant is a synonym of Mild. 
Danger is related to Run. Reverse is a type of Run. 
Smooth --IsA--> Album --UsedFor--> Music <--RelatedTo--> Pleasant <--Synonym--> Mild 
Danger <--RelatedTo--> Run <--IsA-- Reverse 