Assure vs Emphasize - What's the difference?

In transitive terms the difference between assure and emphasize

is that assure is to make sure and secure while emphasize is to stress, give emphasis or extra weight to (something).

(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.

* emphasise

(emphasiz)

To stress, give emphasis or extra weight to (something).

His two-fingered gesture emphasized what he had told his boss to do with his job.

* betone * stress * underscore

* de-emphasize * downplay

* reemphasize * overemphasize * underemphasize