continuance vs duration

continuance and duration both are nouns.

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

As nouns, continuance and duration are synonyms defined as:

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

As nouns, continuance and duration are synonyms defined as:

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

continuance (noun)	duration (noun)
the act of continuing an activity without interruption	continuance in time
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