Vanquish vs Trounce - What's the difference?

As verbs the difference between vanquish and trounce

is that vanquish is to defeat, to overcome while trounce is to win against (someone) by a wide margin; to beat thoroughly, to defeat heavily.

(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.

(trounc)

to win against (someone) by a wide margin; to beat thoroughly, to defeat heavily

The Mexican team trounced the Americans by 10 goals to 1.

to punish

to beat severely; thrash