सुप्तिङन्तं पदम्

That which ends in सुप् 'case-affix' 4.1.2 or तिङ् 3.4.78 (tense-affix), is called पद or inflected word.
The sup or case-affixes are those by which nouns are declined; and tin are tense-affixes by which verbs are conjugated. They have already been given before. Thus ब्राह्मण + जस् = ब्राह्मणाः the Brahmanas पचन्ति they cook.

It might be asked by a caviller why the word अन्त has been used in the aphorism, for by the rule of tadanta given in Sutra 1.1.72 a rule relating to sup will mean and include also that which ended with a sup-affix. To this we reply, that the very fact that the word anta is used in this sutra, indicates by implication (jnapaka) that the Tadanta rule of Sutra 72 Chapter I does not apply to rules of sanjna (definition) made with regard to affixes. Thus tarap and tamap affixes are called gha by Sutra 1.1.22. The tadanta-vidhi will not apply here; words ending with these affixes will not be called gha. Thus ब्राह्मणितरा will not be called gha, for had it been so called, the long ई will be shortened in गौरी ब्राह्मणितरा. In short, 'an affix when employed in a rule which teaches the meaning of a technical term (sanjna) does not denote a word-form ending with the affix.'