preparation vs blacken

preparation is a noun but blacken is not a noun.

Word	Noun	Adjective	Verb	Adverb
preparation	Yes	No	No	No
blacken	No	No	Yes	No

preparation (noun)	blacken (noun)
activity leading to skilled behavior
preparatory school work done outside school (especially at home)
the activity of putting or setting in order in advance of some act or purpose
the act of preparing something (as food) by the application of heat
the cognitive process of thinking about what you will do in the event of something happening
(music) a note that produces a dissonant chord is first heard in a consonant chord
the state of having been made ready or prepared for use or action (especially military action)
a substance prepared according to a formula

preparation (verb)	blacken (verb)
	make or become black
	burn slightly and superficially so as to affect color