Perdón - Pardon me, excuse me - (Used to apologize and to say Excuse me)
Disculpe, Disculpa - Excuse me (formal, familiar, to interrupt in a conversation)
Permiso. Con permiso - Excuse me (to let people know you want to pass them)
Qué pena - What a shame / That's too bad (To express sympathy)
Lo siento - Sorry - (Used to express sympathy and to apologize)