traveling salesman vs commercial traveler

traveling salesman and commercial traveler both are nouns.

Word	Noun	Adjective	Verb	Adverb
traveling salesman	Yes	No	No	No
commercial traveler	Yes	No	No	No

As nouns, traveling salesman and commercial traveler are synonyms defined as:

traveling salesman and commercial traveler: a salesman who travels to call on customers

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

traveling salesman (noun)	commercial traveler (noun)
a salesman who travels to call on customers	a salesman who travels to call on customers