trainman vs railwayman

trainman and railwayman both are nouns.

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

As nouns, trainman and railwayman are synonyms defined as:

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

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