Declension table of ?upaśāyaka

Neuter	Singular	Dual	Plural
Nominative	upaśāyakam	upaśāyake	upaśāyakāni
Vocative	upaśāyaka	upaśāyake	upaśāyakāni
Accusative	upaśāyakam	upaśāyake	upaśāyakāni
Instrumental	upaśāyakena	upaśāyakābhyām	upaśāyakaiḥ
Dative	upaśāyakāya	upaśāyakābhyām	upaśāyakebhyaḥ
Ablative	upaśāyakāt	upaśāyakābhyām	upaśāyakebhyaḥ
Genitive	upaśāyakasya	upaśāyakayoḥ	upaśāyakānām
Locative	upaśāyake	upaśāyakayoḥ	upaśāyakeṣu

Compound upaśāyaka -

Adverb -upaśāyakam -upaśāyakāt