post vs garrison

post and garrison both are nouns.

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

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

Other hyponyms of post include fort, outpost.

As verbs, garrison is a hyponym of post; that is, garrison is a word with a more specific, narrower meaning than post:

Other hyponyms of post include fort, locate, place, site.

post (noun)	garrison (noun)
a job in an organization	a fortified military post where troops are stationed
the delivery and collection of letters and packages	the troops who maintain and guard a fortified place
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

post (verb)	garrison (verb)
display, as of records in sports games	station (troops) in a fort or garrison
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