Declension table of ?dvyantara

Neuter	Singular	Dual	Plural
Nominative	dvyantaram	dvyantare	dvyantarāṇi
Vocative	dvyantara	dvyantare	dvyantarāṇi
Accusative	dvyantaram	dvyantare	dvyantarāṇi
Instrumental	dvyantareṇa	dvyantarābhyām	dvyantaraiḥ
Dative	dvyantarāya	dvyantarābhyām	dvyantarebhyaḥ
Ablative	dvyantarāt	dvyantarābhyām	dvyantarebhyaḥ
Genitive	dvyantarasya	dvyantarayoḥ	dvyantarāṇām
Locative	dvyantare	dvyantarayoḥ	dvyantareṣu

Compound dvyantara -

Adverb -dvyantaram -dvyantarāt