taxidriver vs hack-driver

taxidriver and hack-driver both are nouns.

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

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

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

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