travelling salesman vs commercial traveler

travelling salesman and commercial traveler both are nouns.

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

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

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

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

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