Declension table of ?dvyadhika

Neuter	Singular	Dual	Plural
Nominative	dvyadhikam	dvyadhike	dvyadhikāni
Vocative	dvyadhika	dvyadhike	dvyadhikāni
Accusative	dvyadhikam	dvyadhike	dvyadhikāni
Instrumental	dvyadhikena	dvyadhikābhyām	dvyadhikaiḥ
Dative	dvyadhikāya	dvyadhikābhyām	dvyadhikebhyaḥ
Ablative	dvyadhikāt	dvyadhikābhyām	dvyadhikebhyaḥ
Genitive	dvyadhikasya	dvyadhikayoḥ	dvyadhikānām
Locative	dvyadhike	dvyadhikayoḥ	dvyadhikeṣu

Compound dvyadhika -

Adverb -dvyadhikam -dvyadhikāt