Declension table of ?kāṣṭhaka

Masculine	Singular	Dual	Plural
Nominative	kāṣṭhakaḥ	kāṣṭhakau	kāṣṭhakāḥ
Vocative	kāṣṭhaka	kāṣṭhakau	kāṣṭhakāḥ
Accusative	kāṣṭhakam	kāṣṭhakau	kāṣṭhakān
Instrumental	kāṣṭhakena	kāṣṭhakābhyām	kāṣṭhakaiḥ kāṣṭhakebhiḥ
Dative	kāṣṭhakāya	kāṣṭhakābhyām	kāṣṭhakebhyaḥ
Ablative	kāṣṭhakāt	kāṣṭhakābhyām	kāṣṭhakebhyaḥ
Genitive	kāṣṭhakasya	kāṣṭhakayoḥ	kāṣṭhakānām
Locative	kāṣṭhake	kāṣṭhakayoḥ	kāṣṭhakeṣu

Compound kāṣṭhaka -

Adverb -kāṣṭhakam -kāṣṭhakāt