Declension table of ?hṛdayākāśa

Masculine	Singular	Dual	Plural
Nominative	hṛdayākāśaḥ	hṛdayākāśau	hṛdayākāśāḥ
Vocative	hṛdayākāśa	hṛdayākāśau	hṛdayākāśāḥ
Accusative	hṛdayākāśam	hṛdayākāśau	hṛdayākāśān
Instrumental	hṛdayākāśena	hṛdayākāśābhyām	hṛdayākāśaiḥ hṛdayākāśebhiḥ
Dative	hṛdayākāśāya	hṛdayākāśābhyām	hṛdayākāśebhyaḥ
Ablative	hṛdayākāśāt	hṛdayākāśābhyām	hṛdayākāśebhyaḥ
Genitive	hṛdayākāśasya	hṛdayākāśayoḥ	hṛdayākāśānām
Locative	hṛdayākāśe	hṛdayākāśayoḥ	hṛdayākāśeṣu

Compound hṛdayākāśa -

Adverb -hṛdayākāśam -hṛdayākāśāt