Under Nāmadhāturūpikā, the Nāmadhātu-niṣpādikā helps you to generate a nāmadhātu-vebal-form from the given prātipadika. The Nāmadhātu-viśleṣikā analyses a Nāmadhātu-verbal-form and gives its morphological information.
Verbs play an important role in understanding sentences in any language. In Sanskrit, verb roots (धातवः) are of two types. The roots that are listed in Panini’s Dhātupāṭha are called śuddha-dhātus (औपदेशिकाः), approximately 2000 in number. The verb roots derived adding sanādi-pratyayas are आतिदेशिकाः. The sanādi-pratyayas are twelve in number, viz. सन्, क्यच्, काम्यच्, क्यङ्, क्यष्, क्विप्, यङ्, ईयङ्, यक्, आय, णिच्, णिङ्. In Panini’s Aṣṭādhyāyī, sūtras from ‘गुप्-तिज्-किद्भ्यः सन्' (३|१|४) to ‘सनाद्यन्ता धातवः' (३|१|३२) are related to sanādi-pratyayas. Words which have these pratyayas as suffixes attain dhātu-status by the sūtra ‘सनाद्यन्ता धातवः’.
The seven pratyayas among sanādi - क्यच्, काम्यच्, क्यङ्, क्यष्, क्विप्, णिङ् and णिच्- are called Nāmadhātus (नामधातवः). They transform prātipadikas to dhātus. The Nāmadhātus can inflect in ten lakāras like any other śuddha-dhātus. These Nāmadhātus convey different meanings. They are: icchārtha, āchārārtha, bhavatyartha, karaṇārtha, etc.