What's the difference between forswear and forswearer?

Forswear

Definition:

(v. i.) To reject or renounce upon oath; hence, to renounce earnestly, determinedly, or with protestations.
(v. i.) To deny upon oath.
(v. i.) To swear falsely; to commit perjury.

Example Sentences:

(1) There is something Spielbergian about his commitment to small characters and well-crafted performances, but he forswears Spielberg’s manipulations and sentimentality – real anguish is palpably present here.
(2) It is true I have not been killed or crippled, been a loser in the stocks, or had to forswear my fatherland, but I have not quite gone free and have a right to say something."
(3) But even that glass ran dry after a near brush with death, while the loss of a yard of intestine in the late 1990s led to him forswearing alcohol exactly a year after his younger brother Piers had died of an alcohol-related disease.
(4) They also wanted him to forswear trying those charged in military commissions that the supreme court had junked in a 2008 ruling.
(5) One apparent exception to the Yemen-Somalia model of Obama’s emerging anti-Isis strategy is an explicit forswearing of US ground combat forces in Iraq and Syria , although Obama has sent significant numbers of special operations “advisers” to Iraq.
(6) His February confirmation hearing featured Brennan having to forswear internal knowledge of torture; insisting, contrary to contemporaries’ recollections, that he attempted to stop it; and pledging to work with the committee on a torture report he said he had not fully read.
(7) Who can imagine Israel, India, Pakistan or Iran forswearing nuclear ambitions because we have done so?

Definition:

Example Sentences:

(1) There is something Spielbergian about his commitment to small characters and well-crafted performances, but he forswears Spielberg’s manipulations and sentimentality – real anguish is palpably present here.
(2) It is true I have not been killed or crippled, been a loser in the stocks, or had to forswear my fatherland, but I have not quite gone free and have a right to say something."
(3) But even that glass ran dry after a near brush with death, while the loss of a yard of intestine in the late 1990s led to him forswearing alcohol exactly a year after his younger brother Piers had died of an alcohol-related disease.
(4) They also wanted him to forswear trying those charged in military commissions that the supreme court had junked in a 2008 ruling.
(5) One apparent exception to the Yemen-Somalia model of Obama’s emerging anti-Isis strategy is an explicit forswearing of US ground combat forces in Iraq and Syria , although Obama has sent significant numbers of special operations “advisers” to Iraq.
(6) His February confirmation hearing featured Brennan having to forswear internal knowledge of torture; insisting, contrary to contemporaries’ recollections, that he attempted to stop it; and pledging to work with the committee on a torture report he said he had not fully read.
(7) Who can imagine Israel, India, Pakistan or Iran forswearing nuclear ambitions because we have done so?