What's the difference between excogitate and excogitation?

Excogitate

Definition:

• (v. t.) To think out; to find out or discover by thinking; to devise; to contrive.
• (v. i.) To cogitate.

Example Sentences:

Excogitation

Definition:

• (n.) The act of excogitating; a devising in the thoughts; invention; contrivance.

Example Sentences: