Filter is the opposite of Ideal. Ideal is a synonym of Model. Model is a synonym of Construct. 
Pack is a synonym of Stack. Stack is a type of Load. Load is a synonym of Lot. 
Filter <--Antonym--> Ideal <--Synonym--> Model <--Synonym--> Construct 
Pack <--Synonym--> Stack --IsA--> Load <--Synonym--> Lot 