Concoct vs Concussion - What's the difference?

As a verb concoct

is to prepare something by mixing various ingredients, especially to prepare food for cooking.

a violent collision or shock.

(en verb)

to prepare something by mixing various ingredients, especially to prepare food for cooking

to contrive something using skill or ingenuity

* concocter * concoctor * concoctive

(en noun)

A violent collision or shock.

* Francis Bacon

It is believed that great ringing of bells, in populous cities, hath dissipated pestilent air; which may be from the concussion of the air.

An injury to part of the body, most especially the brain, caused by a violent blow, followed by loss of function.

(legal, civil law) The unlawful forcing of another by threats of violence to yield up something of value.

* Daniel

Then concussion , rapine, pilleries, / Their catalogue of accusations fill.

(Webster 1913)

* concussion fuse * concussion grenade ----