Declension table of ?sāpāya

Neuter	Singular	Dual	Plural
Nominative	sāpāyam	sāpāye	sāpāyāni
Vocative	sāpāya	sāpāye	sāpāyāni
Accusative	sāpāyam	sāpāye	sāpāyāni
Instrumental	sāpāyena	sāpāyābhyām	sāpāyaiḥ
Dative	sāpāyāya	sāpāyābhyām	sāpāyebhyaḥ
Ablative	sāpāyāt	sāpāyābhyām	sāpāyebhyaḥ
Genitive	sāpāyasya	sāpāyayoḥ	sāpāyānām
Locative	sāpāye	sāpāyayoḥ	sāpāyeṣu

Compound sāpāya -

Adverb -sāpāyam -sāpāyāt