Assuage vs Assure - What's the difference?

In transitive terms the difference between assuage and assure

is that assuage is to pacify or soothe (someone) while assure is to make sure and secure.

* (l) (obsolete)

(assuag)

To lessen the intensity of, to mitigate or relieve (hunger, emotion, pain etc.).

* Addison

Refreshing winds the summer's heat assuage .

* Burke

to assuage the sorrows of a desolate old man

* Byron

the fount at which the panting mind assuages / her thirst of knowledge

* 1864 November 21, Abraham Lincoln (signed) or John Hay, letter to Mrs. Bixby in Boston

I pray that our Heavenly Father may assuage the anguish of your bereavement, and leave you only the cherished memory of the loved and lost.

To pacify or soothe (someone).

(obsolete) To calm down, become less violent (of passion, hunger etc.); to subside, to abate.

* assuagement * assuager

* *

(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.