Declension table of ?tapasa

Masculine	Singular	Dual	Plural
Nominative	tapasaḥ	tapasau	tapasāḥ
Vocative	tapasa	tapasau	tapasāḥ
Accusative	tapasam	tapasau	tapasān
Instrumental	tapasena	tapasābhyām	tapasaiḥ tapasebhiḥ
Dative	tapasāya	tapasābhyām	tapasebhyaḥ
Ablative	tapasāt	tapasābhyām	tapasebhyaḥ
Genitive	tapasasya	tapasayoḥ	tapasānām
Locative	tapase	tapasayoḥ	tapaseṣu

Compound tapasa -

Adverb -tapasam -tapasāt