Declension table of āvaśyaka

Neuter	Singular	Dual	Plural
Nominative	āvaśyakam	āvaśyake	āvaśyakāni
Vocative	āvaśyaka	āvaśyake	āvaśyakāni
Accusative	āvaśyakam	āvaśyake	āvaśyakāni
Instrumental	āvaśyakena	āvaśyakābhyām	āvaśyakaiḥ
Dative	āvaśyakāya	āvaśyakābhyām	āvaśyakebhyaḥ
Ablative	āvaśyakāt	āvaśyakābhyām	āvaśyakebhyaḥ
Genitive	āvaśyakasya	āvaśyakayoḥ	āvaśyakānām
Locative	āvaśyake	āvaśyakayoḥ	āvaśyakeṣu

Compound āvaśyaka -

Adverb -āvaśyakam -āvaśyakāt