mail vs post

mail and post both are nouns.

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

As nouns, mail and post are synonyms defined as:

mail and post: the system whereby messages are transmitted via the post office

Other synonyms of mail include mail service, postal service.

As nouns, mail and post are synonyms defined as:

mail and post: any particular collection of letters or packages that is delivered

As verbs, mail and post are synonyms defined as:

Other synonyms of mail include send.

mail (noun)	post (noun)
(Middle Ages) flexible armor made of interlinked metal rings	a job in an organization
a conveyance that transports the letters and packages that are conveyed by the postal system	the delivery and collection of letters and packages
the system whereby messages are transmitted via the post office	an upright consisting of a piece of timber or metal fixed firmly in an upright position
the bags of letters and packages that are transported by the postal service	military installation at which a body of troops is stationed
any particular collection of letters or packages that is delivered	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

mail (verb)	post (verb)
cause to be directed or transmitted to another place	display, as of records in sports games
send via the postal service	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