airmail vs post

airmail and post both are nouns.

Word	Noun	Adjective	Verb	Adverb
airmail	Yes	No	Yes	No
post	Yes	No	Yes	No

As nouns, post is a hypernym of airmail; that is, post is a word with a broader meaning than airmail:

Other hypernyms of airmail include mail, mail service, postal service.

As verbs, post is a hypernym of airmail; that is, post is a word with a broader meaning than airmail:

Other hypernyms of airmail include mail, send.

airmail (noun)	post (noun)
a system of conveying mail by aircraft	a job in an organization
letters and packages that are transported by aircraft	the delivery and collection of letters and packages
	an upright consisting of a piece of timber or metal fixed firmly in an upright position
	military installation at which a body of troops is stationed
	the system whereby messages are transmitted via the post office
	a pole or stake set up to mark something (as the start or end of a race track)
	A message on a social media website
	any particular collection of letters or packages that is delivered
	the position where someone (as a guard or sentry) stands or is assigned to stand

airmail (verb)	post (verb)
send or transport by airmail	display, as of records in sports games
	mark or expose as infamous
	cause to be directed or transmitted to another place
	publicize with, or as if with, a poster
	To post a message on a social media website
	assign to a station
	place so as to be noticed
	mark with a stake
	affix in a public place or for public notice
	ride Western style and bob up and down in the saddle in rhythm with a horse's trotting gait
	transfer (entries) from one account book to another
	enter on a public list
	assign to a post; put into a post