cellblock vs prison

cellblock and prison both are nouns.

Word	Noun	Adjective	Verb	Adverb
cellblock	Yes	No	No	No
prison	Yes	No	No	No

cellblock (noun)	prison (noun)
a division of a prison (usually consisting of several cells)	a correctional institution where persons are confined while on trial or for punishment
	a prisonlike situation; a place of seeming confinement