Stick is a synonym of Stay. Stay is a type of Stop. one thing you do when you Shopping is Stop. 
Expand is the opposite of Factor. Factor is related to Quality. Difference is a type of Quality. 
Stick <--Synonym--> Stay --IsA--> Stop <--HasSubevent-- Shopping 
Expand <--Antonym--> Factor <--RelatedTo--> Quality <--IsA-- Difference 