jailhouse vs workhouse

jailhouse and workhouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
jailhouse	Yes	No	No	No
workhouse	Yes	No	No	No

As nouns, workhouse is a hyponym of jailhouse; that is, workhouse is a word with a more specific, narrower meaning than jailhouse:

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)
workhouse: a county jail that holds prisoners for periods up to 18 months

Other hyponyms of jailhouse include bastille, holding cell, hoosegow, hoosgow, house of correction, lockup.

jailhouse (noun)	workhouse (noun)
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)	a county jail that holds prisoners for periods up to 18 months
	a poorhouse where able-bodied poor are compelled to labor