roadman vs commercial traveller

roadman and commercial traveller both are nouns.

Word	Noun	Adjective	Verb	Adverb
roadman	Yes	No	No	No
commercial traveller	Yes	No	No	No

As nouns, roadman and commercial traveller are synonyms defined as:

roadman and commercial traveller: a salesman who travels to call on customers

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

roadman (noun)	commercial traveller (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