detention centre vs prison cell

detention centre and prison cell both are nouns.

Word	Noun	Adjective	Verb	Adverb
detention centre	Yes	No	No	No
prison cell	Yes	No	No	No

As nouns, prison cell is a hypernym of detention centre; that is, prison cell is a word with a broader meaning than detention centre:

detention centre: a large cell where prisoners (people awaiting trial or sentence or refugees or illegal immigrants) are confined together temporarily
prison cell: a room where a prisoner is kept

Other hypernyms of detention centre include cell, jail cell.

detention centre (noun)	prison cell (noun)
a large cell where prisoners (people awaiting trial or sentence or refugees or illegal immigrants) are confined together temporarily	a room where a prisoner is kept