Expansion is a type of Discussion. Discussion is derived from Discuss. Discuss is a synonym of Discourse. 
Deposit is a type of Security. Deposit is the opposite of Withdrawal. Withdrawal is a type of Departure. 
Expansion --IsA--> Discussion --DerivedFrom--> Discuss <--Synonym--> Discourse 
Security <--IsA-- Deposit <--Antonym--> Withdrawal --IsA--> Departure 