nonreplaceable

As adjectives the difference between irreplaceable and nonreplaceable

is that irreplaceable is that cannot be replaced while nonreplaceable is not replaceable, unable to be replaced.

As a verb replaced

is (replace).

As an adjective nonreplaceable is

not replaceable, unable to be replaced.

As adjectives the difference between replaceable and nonreplaceable

is that replaceable is capable of being replaced while nonreplaceable is not replaceable, unable to be replaced.