Declension table of ?saupanthya

Neuter	Singular	Dual	Plural
Nominative	saupanthyam	saupanthye	saupanthyāni
Vocative	saupanthya	saupanthye	saupanthyāni
Accusative	saupanthyam	saupanthye	saupanthyāni
Instrumental	saupanthyena	saupanthyābhyām	saupanthyaiḥ
Dative	saupanthyāya	saupanthyābhyām	saupanthyebhyaḥ
Ablative	saupanthyāt	saupanthyābhyām	saupanthyebhyaḥ
Genitive	saupanthyasya	saupanthyayoḥ	saupanthyānām
Locative	saupanthye	saupanthyayoḥ	saupanthyeṣu

Compound saupanthya -

Adverb -saupanthyam -saupanthyāt