commercial traveller vs travelling salesman

commercial traveller and travelling salesman both are nouns.

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

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

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

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

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