-Monastery vs. Convent - LN specifically states Robin gets sent to a Convent with no women. Isn’t that a monastery...?
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a Convent is an place where many gather for religious purposes.
A Monastery is an Isolated place where few live in isolation usually for religious purposes
there's also that a Convent is typically female only while a Monastery lacks that connotation
TLDR Convents are usually decently staffed and are full of prospects and acolytes Monastery's are usually very sparsely populated and rarely maintained the few people there are either travellers on a pilgrimage (and liable to leave) or priests and other religious figures who have chosen isolation or to contemplate teachings away from the more populated convents and churches
it's a distinction that eroded with time but this author seems to have affinity for history so it would not surprise me if they knew the difference and were applying it
Bonus Point: Nunnery used to be more of a joke term women were not allowed to be more then Nuns while men could be priests or cardinals or whatever while the term means Home of Nuns it was more of an insult as while hey were partially established to give women a safe place to study religion considering all the abuse and other shit when people said nunnery they were saying it in the same tone one would use for a whorehouse