livery driver vs cabby

livery driver and cabby both are nouns.

Word	Noun	Adjective	Verb	Adverb
livery driver	Yes	No	No	No
cabby	Yes	No	No	No

As nouns, livery driver and cabby are synonyms defined as:

Other synonyms of livery driver include cabdriver, cabman, hack-driver, hack driver, taxidriver, taximan.

livery driver (noun)	cabby (noun)
someone who drives a taxi for a living	someone who drives a taxi for a living