Declension table of ?saptarca

Masculine	Singular	Dual	Plural
Nominative	saptarcaḥ	saptarcau	saptarcāḥ
Vocative	saptarca	saptarcau	saptarcāḥ
Accusative	saptarcam	saptarcau	saptarcān
Instrumental	saptarcena	saptarcābhyām	saptarcaiḥ saptarcebhiḥ
Dative	saptarcāya	saptarcābhyām	saptarcebhyaḥ
Ablative	saptarcāt	saptarcābhyām	saptarcebhyaḥ
Genitive	saptarcasya	saptarcayoḥ	saptarcānām
Locative	saptarce	saptarcayoḥ	saptarceṣu

Compound saptarca -

Adverb -saptarcam -saptarcāt