Declension table of antra

Neuter	Singular	Dual	Plural
Nominative	antram	antre	antrāṇi
Vocative	antra	antre	antrāṇi
Accusative	antram	antre	antrāṇi
Instrumental	antreṇa	antrābhyām	antraiḥ
Dative	antrāya	antrābhyām	antrebhyaḥ
Ablative	antrāt	antrābhyām	antrebhyaḥ
Genitive	antrasya	antrayoḥ	antrāṇām
Locative	antre	antrayoḥ	antreṣu

Compound antra -

Adverb -antram -antrāt