Declension table of ?nāntra

Masculine	Singular	Dual	Plural
Nominative	nāntraḥ	nāntrau	nāntrāḥ
Vocative	nāntra	nāntrau	nāntrāḥ
Accusative	nāntram	nāntrau	nāntrān
Instrumental	nāntreṇa	nāntrābhyām	nāntraiḥ nāntrebhiḥ
Dative	nāntrāya	nāntrābhyām	nāntrebhyaḥ
Ablative	nāntrāt	nāntrābhyām	nāntrebhyaḥ
Genitive	nāntrasya	nāntrayoḥ	nāntrāṇām
Locative	nāntre	nāntrayoḥ	nāntreṣu

Compound nāntra -

Adverb -nāntram -nāntrāt