Declension table of ?nāntra

Neuter	Singular	Dual	Plural
Nominative	nāntram	nāntre	nāntrāṇi
Vocative	nāntra	nāntre	nāntrāṇi
Accusative	nāntram	nāntre	nāntrāṇi
Instrumental	nāntreṇa	nāntrābhyām	nāntraiḥ
Dative	nāntrāya	nāntrābhyām	nāntrebhyaḥ
Ablative	nāntrāt	nāntrābhyām	nāntrebhyaḥ
Genitive	nāntrasya	nāntrayoḥ	nāntrāṇām
Locative	nāntre	nāntrayoḥ	nāntreṣu

Compound nāntra -

Adverb -nāntram -nāntrāt