airport vs heliport

airport and heliport both are nouns.

Word	Noun	Adjective	Verb	Adverb
airport	Yes	No	No	No
heliport	Yes	No	No	No

As nouns, heliport is a hyponym of airport; that is, heliport is a word with a more specific, narrower meaning than airport:

airport: an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo
heliport: an airport for helicopters

airport (noun)	heliport (noun)
an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo	an airport for helicopters