Direct perfect enlightenment with regard to all aspects and abandonment of the stains along with their imprints are called, respectively, ‘Buddha’ and ‘nirvana’.
In truth, these are not two different things.
Liberation is distinguished by indivisibility from qualities present in all their aspects: innumerable, inconceivable, and unpolluted.
Such liberation is also called ‘Tathagata’, Well Gone and Well Come.
―Maitreya, Uttaratantra Shastra