nonperformance

is likely misspelled.

has no English definition.

As a noun nonperformance

is a failure to perform a task, especially a task that one was legally bound to do.

As nouns the difference between performance and nonperformance

is that performance is the act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action while nonperformance is a failure to perform a task, especially a task that one was legally bound to do.

As nouns the difference between breach and nonperformance

is that breach is a gap or opening made by breaking or battering, as in a wall, fortification or levee; the space between the parts of a solid body rent by violence; a break; a rupture; a fissure while nonperformance is a failure to perform a task, especially a task that one was legally bound to do.

As a verb breach

is to make a breach in.

As nouns the difference between nonperformance and assumpsit

is that nonperformance is a failure to perform a task, especially a task that one was legally bound to do while assumpsit is (legal) a promise or undertaking, either express or implied, founded on a consideration.