Declension table of ?sūmaya

Neuter	Singular	Dual	Plural
Nominative	sūmayam	sūmaye	sūmayāni
Vocative	sūmaya	sūmaye	sūmayāni
Accusative	sūmayam	sūmaye	sūmayāni
Instrumental	sūmayena	sūmayābhyām	sūmayaiḥ
Dative	sūmayāya	sūmayābhyām	sūmayebhyaḥ
Ablative	sūmayāt	sūmayābhyām	sūmayebhyaḥ
Genitive	sūmayasya	sūmayayoḥ	sūmayānām
Locative	sūmaye	sūmayayoḥ	sūmayeṣu

Compound sūmaya -

Adverb -sūmayam -sūmayāt