hack-driver vs cabby

hack-driver and cabby both are nouns.

Word	Noun	Adjective	Verb	Adverb
hack-driver	Yes	No	No	No
cabby	Yes	No	No	No

As nouns, hack-driver and cabby are synonyms defined as:

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

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