photoplate making vs photomechanics

photoplate making and photomechanics both are nouns.

Word	Noun	Adjective	Verb	Adverb
photoplate making	Yes	No	No	No
photomechanics	Yes	No	No	No

As nouns, photoplate making and photomechanics are synonyms defined as:

photoplate making and photomechanics: the process whereby printing surfaces (plates or cylinders) are produced by photographic methods

photoplate making (noun)	photomechanics (noun)
the process whereby printing surfaces (plates or cylinders) are produced by photographic methods	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