monastic vs Carthusian

monastic and Carthusian both are nouns.

Word	Noun	Adjective	Verb	Adverb
monastic	Yes	Yes	No	No
Carthusian	Yes	Yes	No	No

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

monastic: a male religious living in a cloister and devoting himself to contemplation and prayer and work
Carthusian: a member of the Carthusian order

Other hyponyms of monastic include Brother, Cistercian, Trappist.

monastic (noun)	Carthusian (noun)
a male religious living in a cloister and devoting himself to contemplation and prayer and work	a member of the Carthusian order

monastic (adjective)	Carthusian (adjective)
of communal life sequestered from the world under religious vows	of or relating to the Carthusian order