What's the difference between affiance and affiancer?

Affiance

Definition:

• (n.) Plighted faith; marriage contract or promise.
• (n.) Trust; reliance; faith; confidence.
• (v. t.) To betroth; to pledge one's faith to for marriage, or solemnly promise (one's self or another) in marriage.
• (v. t.) To assure by promise.

Example Sentences:

Affiancer

Definition:

• (n.) One who makes a contract of marriage between two persons.

Example Sentences: