Declension table of ?viṣṇumukha

Masculine	Singular	Dual	Plural
Nominative	viṣṇumukhaḥ	viṣṇumukhau	viṣṇumukhāḥ
Vocative	viṣṇumukha	viṣṇumukhau	viṣṇumukhāḥ
Accusative	viṣṇumukham	viṣṇumukhau	viṣṇumukhān
Instrumental	viṣṇumukhena	viṣṇumukhābhyām	viṣṇumukhaiḥ viṣṇumukhebhiḥ
Dative	viṣṇumukhāya	viṣṇumukhābhyām	viṣṇumukhebhyaḥ
Ablative	viṣṇumukhāt	viṣṇumukhābhyām	viṣṇumukhebhyaḥ
Genitive	viṣṇumukhasya	viṣṇumukhayoḥ	viṣṇumukhānām
Locative	viṣṇumukhe	viṣṇumukhayoḥ	viṣṇumukheṣu

Compound viṣṇumukha -

Adverb -viṣṇumukham -viṣṇumukhāt