commercial traveller vs commercial traveler

commercial traveller and commercial traveler both are nouns.

Word	Noun	Adjective	Verb	Adverb
commercial traveller	Yes	No	No	No
commercial traveler	Yes	No	No	No

As nouns, commercial traveller and commercial traveler are synonyms defined as:

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

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

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