traveling salesman vs commercial traveller

traveling salesman and commercial traveller both are nouns.

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

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

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

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

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