photomechanics vs photomechanical

photomechanics is a noun but photomechanical is not a noun.

Word	Noun	Adjective	Verb	Adverb
photomechanics	Yes	No	No	No
photomechanical	No	Yes	No	No

photomechanics (noun)	photomechanical (noun)
the technique of using photomechanical methods to make photographs into plates for printing
the process whereby printing surfaces (plates or cylinders) are produced by photographic methods

photomechanics (adjective)	photomechanical (adjective)
	of or relating to or involving various methods of using photography to make plates for printing