commercial traveller vs traveling salesman

commercial traveller and traveling salesman both are nouns.

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

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

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

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

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