train dispatcher vs trainman

train dispatcher and trainman both are nouns.

Word	Noun	Adjective	Verb	Adverb
train dispatcher	Yes	No	No	No
trainman	Yes	No	No	No

As nouns, trainman is a hypernym of train dispatcher; that is, trainman is a word with a broader meaning than train dispatcher:

Other hypernyms of train dispatcher include dispatcher, railroad man, railroader, railway man, railwayman.

train dispatcher (noun)	trainman (noun)
a railroad employer who is in charge of a railway yard	an employee of a railroad