proofreader vs pressman

proofreader and pressman both are nouns.

Word	Noun	Adjective	Verb	Adverb
proofreader	Yes	No	No	No
pressman	Yes	No	No	No

As nouns, pressman is a hypernym of proofreader; that is, pressman is a word with a broader meaning than proofreader:

proofreader: someone who reads proof in order to find errors and mark corrections
pressman: someone whose occupation is printing

Other hypernyms of proofreader include printer.

proofreader (noun)	pressman (noun)
someone who reads proof in order to find errors and mark corrections	someone whose occupation is printing
	a male journalist employed to provide news stories for newspapers or broadcast media