Plastic is a type of Invention. Plastic can be Clear. Clear is the opposite of Invisible. 
Chill is a type of Symptom. Symptom is the opposite of Cause. Cause is related to Motive. Motive is a synonym of Motivation. 
Invention <--IsA-- Plastic --HasProperty--> Clear <--Antonym--> Invisible 
Chill --IsA--> Symptom <--Antonym--> Cause <--RelatedTo--> Motive <--Synonym--> Motivation 