youth hostel vs hostel

youth hostel and hostel both are nouns.

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

As nouns, youth hostel and hostel are synonyms defined as:

youth hostel and hostel: inexpensive supervised lodging (especially for youths on bicycling trips)

Other synonyms of youth hostel include student lodging.

youth hostel (noun)	hostel (noun)
inexpensive supervised lodging (especially for youths on bicycling trips)	inexpensive supervised lodging (especially for youths on bicycling trips)
	a hotel providing overnight lodging for travelers