What's the difference between wiver and wyvern?

Wiver

Definition:

• (n.) Alt. of Wivern

Example Sentences:

Wyvern

Definition:

• (n.) Same as Wiver.

Example Sentences:

• (1) Bauer is now understood to be the preferred bidder for Heart 106 in the east Midlands, and BRMB, Beacon, Mercia and Wyvern in the West Midlands.