Assure vs Pacify - What's the difference?

In transitive terms the difference between assure and pacify

is that assure is to make sure and secure while pacify is to appease (someone).

(assur)

To make sure and secure.

To give (someone) confidence in the trustworthiness of (something).

I assure you that the program will work smoothly when we demonstrate it to the client.

He assured of his commitment to her happiness.

(obsolete) To guarantee, promise (to do something).

* 1590 , Edmund Spenser, The Faerie Queene , II.ii:

That as a law for euer should endure; / Which to obserue in word of knights they did assure .

To reassure.

(en-verb)

To bring peace to (a place or situation), by ending war, fighting, violence, anger or agitation.

To appease (someone).

* pacifier