heliport vs airdrome

heliport and airdrome both are nouns.

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

As nouns, airdrome is a hypernym of heliport; that is, airdrome is a word with a broader meaning than heliport:

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

Other hypernyms of heliport include aerodrome, airport, drome.

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