commercial traveler vs travelling salesman

commercial traveler and travelling salesman both are nouns.

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

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

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

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

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