Nyaya – The root and the suffix.

प्रकृतिप्रत्ययर्शयोप्रत्ययर्शस्यप्रधानात्वमिति न्यायः

The meaning of a word or a root depends upon that of the suffix for completion of sense. It is applied in cases in which the question of the superiority or inferiority is to be decided.