Overshadow vs Overwhelm - What's the difference?

As verbs the difference between overshadow and overwhelm

is that overshadow is to obscure something by casting a shadow while overwhelm is to engulf, surge over and submerge.

(en verb)

To obscure something by casting a shadow.

To dominate something and make it seem insignificant.

To engulf, surge over and submerge.

The dinghy was overwhelmed by the great wave.

To overpower, crush.

In December 1939 the Soviet Union attacked Finland with overwhelming force.

* Bible, Psalms lxxviii. 53

The sea overwhelmed their enemies.

To overpower emotionally.

He was overwhelmed with guilt.

Joy overwhelmed her when she realized that she had won a million dollars.

To cause to surround, to cover.

(Papin)

* overwhelming