hostel vs caravanserai

hostel and caravanserai both are nouns.

Word	Noun	Adjective	Verb	Adverb
hostel	Yes	No	No	No
caravanserai	Yes	No	No	No

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

hostel: a hotel providing overnight lodging for travelers
caravanserai: an inn in some eastern countries with a large courtyard that provides accommodation for caravans

Other hyponyms of hostel include caravan inn, caravansary, khan, imaret, post house, posthouse, roadhouse.

hostel (noun)	caravanserai (noun)
inexpensive supervised lodging (especially for youths on bicycling trips)	an inn in some eastern countries with a large courtyard that provides accommodation for caravans
a hotel providing overnight lodging for travelers