railroader vs railway man

railroader and railway man both are nouns.

Word	Noun	Adjective	Verb	Adverb
railroader	Yes	No	No	No
railway man	Yes	No	No	No

As nouns, railroader and railway man are synonyms defined as:

Other synonyms of railroader include railroad man, railwayman, trainman.

railroader (noun)	railway man (noun)
an employee of a railroad	an employee of a railroad