imprisonment vs confinement

imprisonment and confinement both are nouns.

Word	Noun	Adjective	Verb	Adverb
imprisonment	Yes	No	No	No
confinement	Yes	No	No	No

As nouns, confinement is a hypernym of imprisonment; that is, confinement is a word with a broader meaning than imprisonment:

imprisonment: the act of confining someone in a prison (or as if in a prison)
confinement: the act of restraining of a person's liberty by confining them

As nouns, confinement is a hypernym of imprisonment; that is, confinement is a word with a broader meaning than imprisonment:

imprisonment (noun)	confinement (noun)
the act of confining someone in a prison (or as if in a prison)	the act of restraining of a person's liberty by confining them
putting someone in prison or in jail as lawful punishment	the act of keeping something within specified bounds (by force if necessary)
the state of being imprisoned	the state of being confined
	concluding state of pregnancy; from the onset of contractions to the birth of a child