roadman vs travelling salesman

roadman and travelling salesman both are nouns.

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

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

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

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

roadman (noun)	travelling 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