Declension table of ?phalasahasra

Neuter	Singular	Dual	Plural
Nominative	phalasahasram	phalasahasre	phalasahasrāṇi
Vocative	phalasahasra	phalasahasre	phalasahasrāṇi
Accusative	phalasahasram	phalasahasre	phalasahasrāṇi
Instrumental	phalasahasreṇa	phalasahasrābhyām	phalasahasraiḥ
Dative	phalasahasrāya	phalasahasrābhyām	phalasahasrebhyaḥ
Ablative	phalasahasrāt	phalasahasrābhyām	phalasahasrebhyaḥ
Genitive	phalasahasrasya	phalasahasrayoḥ	phalasahasrāṇām
Locative	phalasahasre	phalasahasrayoḥ	phalasahasreṣu

Compound phalasahasra -

Adverb -phalasahasram -phalasahasrāt