"Katha" is a feminine noun in Sanskrit. The shabd roop of "katha" in different cases are: Prathama (Nominative) - katha, Dvitiya (Accusative) - katham, Tritiya (Instrumental) - kathā, Chaturthi (Dative) - kathāyaḥ, Panchami (Ablative) - kathāt.
The shabd roop of "Ambika" in Sanskrit is "Ambikā."
The Shabd roop of "sadhu" in Sanskrit is "sadhu." This word remains the same in its Shabd roop form.
sanskrit shabd roop of sadhu
The Shabd roop of "kirti" in Sanskrit is "kirtih."
The Shabd roop of "Bhagwat" in Sanskrit would be "Bhagavat."
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The shabd roop of Mata is Matru (मातृ ) pronounced 'matr' meaning 'mother'.
The Shabd Roop of "jagat" in Sanskrit is "jagatam" (जगतम्).
The shabd roop of "yushmad" is "yushmabhyam."
chatrah
rikarantha
The shabd roop is "dhenu" (ukaraanta strilinga shabda).For more information, try the "dhaturoopavali" published by navneet.