imprisonment vs durance

imprisonment and durance both are nouns.

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

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

Other hyponyms of imprisonment include life imprisonment, internment.

imprisonment (noun)	durance (noun)
the act of confining someone in a prison (or as if in a prison)	imprisonment (especially for a long time)
putting someone in prison or in jail as lawful punishment
the state of being imprisoned