holding cell vs jailhouse

holding cell and jailhouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
holding cell	Yes	No	No	No
jailhouse	Yes	No	No	No

As nouns, jailhouse is a hypernym of holding cell; that is, jailhouse is a word with a broader meaning than holding cell:

holding cell: a jail in a courthouse where accused persons can be confined during a trial
jailhouse: a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence)

Other hypernyms of holding cell include clink, gaol, jail, pokey, poky, slammer.

holding cell (noun)	jailhouse (noun)
a jail in a courthouse where accused persons can be confined during a trial	a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence)