Declension table of ?yamastoma

Masculine	Singular	Dual	Plural
Nominative	yamastomaḥ	yamastomau	yamastomāḥ
Vocative	yamastoma	yamastomau	yamastomāḥ
Accusative	yamastomam	yamastomau	yamastomān
Instrumental	yamastomena	yamastomābhyām	yamastomaiḥ yamastomebhiḥ
Dative	yamastomāya	yamastomābhyām	yamastomebhyaḥ
Ablative	yamastomāt	yamastomābhyām	yamastomebhyaḥ
Genitive	yamastomasya	yamastomayoḥ	yamastomānām
Locative	yamastome	yamastomayoḥ	yamastomeṣu

Compound yamastoma -

Adverb -yamastomam -yamastomāt