Declension table of ?vasta

Masculine	Singular	Dual	Plural
Nominative	vastaḥ	vastau	vastāḥ
Vocative	vasta	vastau	vastāḥ
Accusative	vastam	vastau	vastān
Instrumental	vastena	vastābhyām	vastaiḥ vastebhiḥ
Dative	vastāya	vastābhyām	vastebhyaḥ
Ablative	vastāt	vastābhyām	vastebhyaḥ
Genitive	vastasya	vastayoḥ	vastānām
Locative	vaste	vastayoḥ	vasteṣu

Compound vasta -

Adverb -vastam -vastāt