Declension table of ?bṛhattvac

Masculine	Singular	Dual	Plural
Nominative	bṛhattvaṅ	bṛhattvañcau	bṛhattvañcaḥ
Vocative	bṛhattvaṅ	bṛhattvañcau	bṛhattvañcaḥ
Accusative	bṛhattvañcam	bṛhattvañcau	bṛhattūcaḥ
Instrumental	bṛhattūcā	bṛhattvagbhyām	bṛhattvagbhiḥ
Dative	bṛhattūce	bṛhattvagbhyām	bṛhattvagbhyaḥ
Ablative	bṛhattūcaḥ	bṛhattvagbhyām	bṛhattvagbhyaḥ
Genitive	bṛhattūcaḥ	bṛhattūcoḥ	bṛhattūcām
Locative	bṛhattūci	bṛhattūcoḥ	bṛhattvakṣu

Compound bṛhattvak -

Adverb -bṛhattvaṅ