rectify

As a noun taxonomy

is the science or the technique used to make a classification.

As a verb rectify is

to correct or amend something.

In transitive terms the difference between ratify and rectify

is that ratify is to give formal consent to; make officially valid while rectify is to correct or amend something.

In lang=en terms the difference between rectify and recover

is that rectify is to correct or amend something while recover is to regain one's composure, balance etc.

As verbs the difference between rectify and recover

is that rectify is to correct or amend something while recover is to get back, regain (a physical thing lost etc) or recover can be to cover again.

As a noun recover is

(label) recovery.

In transitive terms the difference between identify and rectify

is that identify is to equate or make the same; to unite or combine into one while rectify is to correct or amend something.