roadman vs traveling salesman

roadman and traveling salesman both are nouns.

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

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

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

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

roadman (noun)	traveling salesman (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