livery driver vs cabdriver

livery driver and cabdriver both are nouns.

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

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

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

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