Derates vs Aerates - What's the difference?

As a noun derates

is .

(head)

(derate)

* * * * * *

(derat)

To lower the rated capability of any rated equipment or material.

The derated engine sold at a lower price, but had the same components as the standard model.

* * * *

(head)

(aerate)

(en-verb)

To supply oxygen or air.

* aeration * aerator