steward vs air host

steward and air host both are nouns.

Word	Noun	Adjective	Verb	Adverb
steward	Yes	No	No	No
air host	Yes	No	No	No

As nouns, air host is a hyponym of steward; that is, air host is a word with a more specific, narrower meaning than steward:

Other hyponyms of steward include air hostess, hostess, stewardess.

steward (noun)	air host (noun)
someone who manages property or other affairs for someone else	a male steward on an airplane
a union member who is elected to represent fellow workers in negotiating with management
one having charge of buildings or grounds or animals
an attendant on an airplane
the ship's officer who is in charge of provisions and dining arrangements