hosepipe vs airline

hosepipe and airline both are nouns.

Word	Noun	Adjective	Verb	Adverb
hosepipe	Yes	No	No	No
airline	Yes	No	No	No

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

Other hyponyms of hosepipe include air hose, fire hose, garden hose, radiator hose, water cannon, watercannon.

hosepipe (noun)	airline (noun)
a flexible pipe for conveying a liquid or gas	a commercial enterprise that provides scheduled flights for passengers
	a hose that carries air under pressure