travelling salesman vs roadman

travelling salesman and roadman both are nouns.

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

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

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

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

travelling 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