Declension table of ?sīsa

Neuter	Singular	Dual	Plural
Nominative	sīsam	sīse	sīsāni
Vocative	sīsa	sīse	sīsāni
Accusative	sīsam	sīse	sīsāni
Instrumental	sīsena	sīsābhyām	sīsaiḥ
Dative	sīsāya	sīsābhyām	sīsebhyaḥ
Ablative	sīsāt	sīsābhyām	sīsebhyaḥ
Genitive	sīsasya	sīsayoḥ	sīsānām
Locative	sīse	sīsayoḥ	sīseṣu

Compound sīsa -

Adverb -sīsam -sīsāt