railroad train vs rider

railroad train and rider both are nouns.

Word	Noun	Adjective	Verb	Adverb
railroad train	Yes	No	No	No
rider	Yes	No	No	No

railroad train (noun)	rider (noun)
public transport provided by a line of railway cars coupled together and drawn by a locomotive	a clause that is appended to a legislative bill
	a traveler who actively rides an animal (as a horse or camel)
	a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
	a traveler who actively rides a vehicle (as a bicycle or motorcycle)