duration vs continuance

duration and continuance both are nouns.

Word	Noun	Adjective	Verb	Adverb
duration	Yes	No	No	No
continuance	Yes	No	No	No

As nouns, duration and continuance are synonyms defined as:

duration and continuance: the property of enduring or continuing in time

As nouns, duration and continuance are synonyms defined as:

duration and continuance: the period of time during which something continues

duration (noun)	continuance (noun)
continuance in time	the act of continuing an activity without interruption
the property of enduring or continuing in time	the property of enduring or continuing in time
the period of time during which something continues	the period of time during which something continues