pressman vs proofreader

pressman and proofreader both are nouns.

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

As nouns, proofreader is a hyponym of pressman; that is, proofreader is a word with a more specific, narrower meaning than pressman:

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

Other hyponyms of pressman include compositor, setter, typesetter, typographer, reader.

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