farewell vs later

farewell

• Goodbye. 

• To bid farewell or say goodbye. 

• Parting, valedictory, final. 

• A departure; the act of leaving 

• A wish of happiness or safety at parting, especially a permanent departure 

later

• See you later; goodbye. 

• At some time in the future. 

• Coming afterward in distance (following an antecedent distance as embedded within an adverbial phrase) 

• Coming afterward in time (used with than when comparing with another time). 

• Afterward in time (used with than when comparing with another time). 

• At some unspecified time in the future.