traveling salesman vs roadman

traveling salesman and roadman both are nouns.

Word	Noun	Adjective	Verb	Adverb
traveling salesman	Yes	No	No	No
roadman	Yes	No	No	No

As nouns, traveling salesman and roadman are synonyms defined as:

traveling salesman and roadman: a salesman who travels to call on customers

Other synonyms of traveling salesman include bagman, commercial traveler, commercial traveller, travelling salesman.

traveling salesman (noun)	roadman (noun)
a salesman who travels to call on customers	a salesman who travels to call on customers
	a workman who is employed to repair roads