The difference between Abnegation and Renunciation

When used as nouns, abnegation means a denial, whereas renunciation means the act of rejecting or renouncing something as invalid.

check bellow for the other definitions of Abnegation and Renunciation

Abnegation as a noun:

A denial; a renunciation; denial of desire or self-interest.

Renunciation as a noun:

the act of rejecting or renouncing something as invalid

Examples:

"The President's renunciation of the treaty has upset Congress."

"The life of the spirit demands readiness for renunciation when the occasion arises..."
Renunciation as a noun:

the resignation of an ecclesiastical office

Examples:

"The bishop's renunciation was on account of his ill health."
Renunciation as a noun (legal):

The act by which a person abandons a right acquired, but without transferring it to another.
Renunciation as a noun (Christianity):

In the Anglican baptismal service, the part in which the candidate in person or by his sureties renounces the Devil and all his works.