Declension table of ?tṛṇavistara

Masculine	Singular	Dual	Plural
Nominative	tṛṇavistaraḥ	tṛṇavistarau	tṛṇavistarāḥ
Vocative	tṛṇavistara	tṛṇavistarau	tṛṇavistarāḥ
Accusative	tṛṇavistaram	tṛṇavistarau	tṛṇavistarān
Instrumental	tṛṇavistareṇa	tṛṇavistarābhyām	tṛṇavistaraiḥ tṛṇavistarebhiḥ
Dative	tṛṇavistarāya	tṛṇavistarābhyām	tṛṇavistarebhyaḥ
Ablative	tṛṇavistarāt	tṛṇavistarābhyām	tṛṇavistarebhyaḥ
Genitive	tṛṇavistarasya	tṛṇavistarayoḥ	tṛṇavistarāṇām
Locative	tṛṇavistare	tṛṇavistarayoḥ	tṛṇavistareṣu

Compound tṛṇavistara -

Adverb -tṛṇavistaram -tṛṇavistarāt