What's the difference between decreation and decretion?

Decreation

Definition:

• (n.) Destruction; -- opposed to creation.

Example Sentences:

Decretion

Definition:

• (n.) A decrease.

Example Sentences:

• (1) These studies indicate bidirectional, possible active, uric acidtransport in the proximal tubule undr control conditions, with net reabsorption evident early and net decretion apparent late in this nephron segment.