Hostel
Part of speech: noun
Definition: A budget-oriented overnight lodging place, with dormitory accommodation and shared facilities Especially, short for youth hostel A temporary refuge for the homeless providing a bed and sometimes food (this definition is not used in the USA)
Dormitory
Part of speech: noun
Definition: A room containing a number of beds (and often some other furniture and/or utilities) for sleeping, often applied to student and backpacker accommodation of this kind. Common abbreviation: dormA building or part of a building which houses students, soldiers, monks etc. who sleep there and use communal further facilities.Short for dormitory town, a suburban or rural settlement housing city workers