Declension table of ?goṣṭhika

Masculine	Singular	Dual	Plural
Nominative	goṣṭhikaḥ	goṣṭhikau	goṣṭhikāḥ
Vocative	goṣṭhika	goṣṭhikau	goṣṭhikāḥ
Accusative	goṣṭhikam	goṣṭhikau	goṣṭhikān
Instrumental	goṣṭhikena	goṣṭhikābhyām	goṣṭhikaiḥ goṣṭhikebhiḥ
Dative	goṣṭhikāya	goṣṭhikābhyām	goṣṭhikebhyaḥ
Ablative	goṣṭhikāt	goṣṭhikābhyām	goṣṭhikebhyaḥ
Genitive	goṣṭhikasya	goṣṭhikayoḥ	goṣṭhikānām
Locative	goṣṭhike	goṣṭhikayoḥ	goṣṭhikeṣu

Compound goṣṭhika -

Adverb -goṣṭhikam -goṣṭhikāt