Vanquish vs Overbear - What's the difference?

Vanquish is a related term of overbear.

is that vanquish is to defeat, to overcome while overbear is (obsolete|transitive) to carry over.

(es)

To defeat, to overcome.

* Clarendon

They vanquished the rebels in all encounters.

* Atterbury

This bold assertion has been fully vanquished in a late reply to the Bishop of Meaux's treatise.

(obsolete) To carry over.

To push through by physical weight or strength; to overwhelm, overcome.

* c. 1390 , (Geoffrey Chaucer), ‘The Wife of Bath's Tale’, , Penguin Classics, p. 287:

I attacked first and they were overborne , / Glad to apologize and even suing / Pardon for what they'd never thought of doing.

To prevail over; to dominate, overpower; to oppress.

*1596 , (Edmund Spenser), The Faerie Queene , V.11:

*:It often fals, in course of common life, / That right long time is overborne of wrong […].

To produce an overabundance of fruit.