gypsy cab vs taxi

gypsy cab and taxi both are nouns.

Word	Noun	Adjective	Verb	Adverb
gypsy cab	Yes	No	No	No
taxi	Yes	No	Yes	No

As nouns, taxi is a hypernym of gypsy cab; that is, taxi is a word with a broader meaning than gypsy cab:

gypsy cab: a taxicab that cruises for customers although it is licensed only to respond to calls
taxi: a car driven by a person whose job is to take passengers where they want to go in exchange for money

Other hypernyms of gypsy cab include cab, hack, taxicab.

gypsy cab (noun)	taxi (noun)
a taxicab that cruises for customers although it is licensed only to respond to calls	a car driven by a person whose job is to take passengers where they want to go in exchange for money

gypsy cab (verb)	taxi (verb)
	ride in a taxicab
	travel slowly