Declension table of ?samāntara

Neuter	Singular	Dual	Plural
Nominative	samāntaram	samāntare	samāntarāṇi
Vocative	samāntara	samāntare	samāntarāṇi
Accusative	samāntaram	samāntare	samāntarāṇi
Instrumental	samāntareṇa	samāntarābhyām	samāntaraiḥ
Dative	samāntarāya	samāntarābhyām	samāntarebhyaḥ
Ablative	samāntarāt	samāntarābhyām	samāntarebhyaḥ
Genitive	samāntarasya	samāntarayoḥ	samāntarāṇām
Locative	samāntare	samāntarayoḥ	samāntareṣu

Compound samāntara -

Adverb -samāntaram -samāntarāt