Declension table of ?gardhana

Neuter	Singular	Dual	Plural
Nominative	gardhanam	gardhane	gardhanāni
Vocative	gardhana	gardhane	gardhanāni
Accusative	gardhanam	gardhane	gardhanāni
Instrumental	gardhanena	gardhanābhyām	gardhanaiḥ
Dative	gardhanāya	gardhanābhyām	gardhanebhyaḥ
Ablative	gardhanāt	gardhanābhyām	gardhanebhyaḥ
Genitive	gardhanasya	gardhanayoḥ	gardhanānām
Locative	gardhane	gardhanayoḥ	gardhaneṣu

Compound gardhana -

Adverb -gardhanam -gardhanāt