lodge vs posthouse

lodge and posthouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
lodge	Yes	No	Yes	No
posthouse	Yes	No	No	No

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

Other hyponyms of lodge include caravan inn, caravansary, caravanserai, khan, imaret, post house, roadhouse.

lodge (noun)	posthouse (noun)
any of various Native American dwellings	an inn for exchanging post horses and accommodating riders
a hotel providing overnight lodging for travelers
a small (rustic) house used as a temporary shelter
small house at the entrance to the grounds of a country mansion; usually occupied by a gatekeeper or gardener
a formal association of people with similar interests