monk vs monastic

monk and monastic both are nouns.

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

As nouns, monk and monastic are synonyms defined as:

monk and monastic: a male religious living in a cloister and devoting himself to contemplation and prayer and work

monk (noun)	monastic (noun)
a male religious living in a cloister and devoting himself to contemplation and prayer and work	a male religious living in a cloister and devoting himself to contemplation and prayer and work

monk (adjective)	monastic (adjective)
	of communal life sequestered from the world under religious vows