Declension table of ?samarthya

Masculine	Singular	Dual	Plural
Nominative	samarthyaḥ	samarthyau	samarthyāḥ
Vocative	samarthya	samarthyau	samarthyāḥ
Accusative	samarthyam	samarthyau	samarthyān
Instrumental	samarthyena	samarthyābhyām	samarthyaiḥ samarthyebhiḥ
Dative	samarthyāya	samarthyābhyām	samarthyebhyaḥ
Ablative	samarthyāt	samarthyābhyām	samarthyebhyaḥ
Genitive	samarthyasya	samarthyayoḥ	samarthyānām
Locative	samarthye	samarthyayoḥ	samarthyeṣu

Compound samarthya -

Adverb -samarthyam -samarthyāt