Declension table of ?ārca

Neuter	Singular	Dual	Plural
Nominative	ārcam	ārce	ārcāni
Vocative	ārca	ārce	ārcāni
Accusative	ārcam	ārce	ārcāni
Instrumental	ārcena	ārcābhyām	ārcaiḥ
Dative	ārcāya	ārcābhyām	ārcebhyaḥ
Ablative	ārcāt	ārcābhyām	ārcebhyaḥ
Genitive	ārcasya	ārcayoḥ	ārcānām
Locative	ārce	ārcayoḥ	ārceṣu

Compound ārca -

Adverb -ārcam -ārcāt