railroader vs trainman

railroader and trainman both are nouns.

Word	Noun	Adjective	Verb	Adverb
railroader	Yes	No	No	No
trainman	Yes	No	No	No

As nouns, railroader and trainman are synonyms defined as:

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

railroader (noun)	trainman (noun)
an employee of a railroad	an employee of a railroad