What's the difference between avouch and avoucher?

Avouch

Definition:

(v. t.) To appeal to; to cite or claim as authority.
(v. t.) To maintain a just or true; to vouch for.
(v. t.) To declare or assert positively and as matter of fact; to affirm openly.
(v. t.) To acknowledge deliberately; to admit; to confess; to sanction.
(n.) Evidence; declaration.

Example Sentences: